GlennWest Posted August 7, 2021 Report Share Posted August 7, 2021 (edited) Was putting my positive cables to one from each battery today. Noticed no spark or shunt light come on with first battery. Checked voltage and lower than should be. Checked for ground at bms to positive and zero volts. Bms fried. This had to happen when wrench shorted out. Battery pack at 49 volts. This is what all were before I bought the charger. The others 58v now. Edited August 8, 2021 by GlennWest Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Daveh Posted August 7, 2021 Report Share Posted August 7, 2021 Bummer. Quote Dave and Lana Hasper Link to comment Share on other sites More sharing options...
GlennWest Posted August 8, 2021 Author Report Share Posted August 8, 2021 Guy I bought from is sending me a new one. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Kirk W Posted August 8, 2021 Report Share Posted August 8, 2021 13 hours ago, GlennWest said: Was putting my positive cables to one from each battery today. Noticed no spark or shunt light come on with first battery. That is the reason that most of us advocate always putting the negative cable to the frame ground back last and removing it first. If you do that you won't get the spark when a wrench slips. Quote Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
GlennWest Posted August 8, 2021 Author Report Share Posted August 8, 2021 This happened some time back. I posted about it. Taking negative off would not have helped. wrench shorted out on battery case. I had neglected taping the negative connection at the bms and it was touching the frame. So it sent 48+ volts to negative side of that bms. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
GlennWest Posted August 8, 2021 Author Report Share Posted August 8, 2021 (edited) I really need to move the bms to top of battery where I can get to them. That one farest from door is just about impossible to get at. That one that fried. I will have to disconnect the wall i built and lay battery packs down. I remember telling myself that bms ever fails I can't get ot it when layed that battery pack up. Just hadn't dawned on me to relocated the bms. An afterthought, with bms at top of battery and positive at top of battery is this not properly wired? I am sure the bms will equalize the cells though. I could extend the bms connection. Edited August 8, 2021 by GlennWest Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Randyretired Posted August 8, 2021 Report Share Posted August 8, 2021 2 hours ago, Kirk W said: That is the reason that most of us advocate always putting the negative cable to the frame ground back last and removing it first. If you do that you won't get the spark when a wrench slips. This was a relatively simple and effective solution until the advent of solar, inverters and lithium batteries. Most now suggest a battery cutoff switch. This allows the wiring to be completed and then switched on after completing necessary functions such as precharging capacitors. Quote Randy 2001 Volvo VNL 42 Cummins ISX Autoshift Link to comment Share on other sites More sharing options...
henryaham897 Posted September 14, 2021 Report Share Posted September 14, 2021 Very effective tips guys thanks a lot! Quote Link to comment Share on other sites More sharing options...
Ray,IN Posted September 14, 2021 Report Share Posted September 14, 2021 On 8/8/2021 at 10:28 AM, Randyretired said: This was a relatively simple and effective solution until the advent of solar, inverters and lithium batteries. Most now suggest a battery cutoff switch. This allows the wiring to be completed and then switched on after completing necessary functions such as precharging capacitors. re: what happened to Glenn; How would one install a battery cutoff between the positive cable/post and metal battery case? Quote 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
Randyretired Posted September 14, 2021 Report Share Posted September 14, 2021 5 hours ago, Ray,IN said: re: what happened to Glenn; How would one install a battery cutoff between the positive cable/post and metal battery case? I turn off the BMS's. A battery cutoff doesn't have to be on the positive side. However, you are right that when working on a battery there is inherent risk that cannot be avoided. Quote Randy 2001 Volvo VNL 42 Cummins ISX Autoshift Link to comment Share on other sites More sharing options...
Ray,IN Posted September 14, 2021 Report Share Posted September 14, 2021 I have some wrenches kept in the battery compartment that are wrapped with electrical tape except for the box-ends, and I only have FLA batteries. I learned early-on to remove all rings and watches, in a flash things get very hot. Thanks for the education Randy, I didn't know turning off a BMS cut off voltage. Quote 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
GlennWest Posted September 14, 2021 Author Report Share Posted September 14, 2021 I turned mine off too. Fried it. Lol Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Kirk W Posted September 14, 2021 Report Share Posted September 14, 2021 Been working around and with batteries since the early 60's and learned very early to always lift the negative battery cable first. Can't say that I've never burned a tool but darned few from that. Now working around capacitors is an entirely different issue! Quote Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
GlennWest Posted September 14, 2021 Author Report Share Posted September 14, 2021 But removing negative does nothing in my case. I have cells bolted together with negative and positive on each cell. Busbars linking each cell together. Frame work got grounded and wrench bumped it. Tapping wrench only protection for me Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
57becky Posted September 18, 2021 Report Share Posted September 18, 2021 One of these will save a lot of injuries when working on batteries. It may seem expensive, but in the end it's good insurance. https://www.amazon.com/Klein-Tools-KT223X4-INS-Linemans-Insulating/dp/B006FXPYK2/ref=pd_sbs_6/146-5548872-2326566?pd_rd_w=fo8NY&pf_rd_p=0f56f70f-21e6-4d11-bb4a-bcdb928a3c5a&pf_rd_r=AKSMXB3AMNSG8W65ZA0P&pd_rd_r=551203b8-eabb-4972-b7c7-3554d83a5e30&pd_rd_wg=o5xCI&pd_rd_i=B006FXPYK2&psc=1 Quote Link to comment Share on other sites More sharing options...
GlennWest Posted September 18, 2021 Author Report Share Posted September 18, 2021 (edited) My battery bolts 10mm heads. Installing new bms. Started raining and not stopped since. Get finished when clears up I reckon. Having to change bms connector. Couldn't get exact same bms. Upgraded unit. Lengthening leads so can relocate to top. Edited September 18, 2021 by GlennWest Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
folivier Posted September 19, 2021 Report Share Posted September 19, 2021 Klein makes great crescent wrenches with insulated handles. I've also used shrink tubing to insulate open end wrenches, makes a cleaner job than tape. BTW wear your glasses when working around batteries! Quote Back on the road again in a 2011 Roadtrek 210P 2011 Tahoe 4x4, 2006 Lexus GX470, 2018 Ranger XP1000, 2013 RZR 570LEhttp://finallynewellin.blogspot.com/ Link to comment Share on other sites More sharing options...
GlennWest Posted September 19, 2021 Author Report Share Posted September 19, 2021 Wear glasses, lol. I'm blind without them. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Ray,IN Posted September 19, 2021 Report Share Posted September 19, 2021 18 hours ago, 57becky said: One of these will save a lot of injuries when working on batteries. It may seem expensive, but in the end it's good insurance. https://www.amazon.com/Klein-Tools-KT223X4-INS-Linemans-Insulating/dp/B006FXPYK2/ref=pd_sbs_6/146-5548872-2326566?pd_rd_w=fo8NY&pf_rd_p=0f56f70f-21e6-4d11-bb4a-bcdb928a3c5a&pf_rd_r=AKSMXB3AMNSG8W65ZA0P&pd_rd_r=551203b8-eabb-4972-b7c7-3554d83a5e30&pd_rd_wg=o5xCI&pd_rd_i=B006FXPYK2&psc=1 However that wrench does nothing to prevent shorting battery connections to ground with the opposite end, it merely protects the user from getting an electrical charge or burned by the hot wrench. Quote 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
bobsallyh Posted September 19, 2021 Report Share Posted September 19, 2021 Another good idea when working on batteries is to remove rings and any other jewelry. A friend of mind was changing batteries in an Airstream Diesel pusher which were a real PITA and darn near lost a finger. Quote Link to comment Share on other sites More sharing options...
GlennWest Posted September 19, 2021 Author Report Share Posted September 19, 2021 (edited) Early in my welding career, 18 years old, Welding with a ring on finger. Splatter landed on that ring. Gold really carries heat good. Needless to say I no longer wear rings. Also just finished wiring up bms. Pack little over 58v now. Edited September 19, 2021 by GlennWest Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Lou Schneider Posted September 20, 2021 Report Share Posted September 20, 2021 (edited) 22 hours ago, Ray,IN said: However that wrench does nothing to prevent shorting battery connections to ground with the opposite end, it merely protects the user from getting an electrical charge or burned by the hot wrench. Look at the pictures again, the two ends aren't connected and stop short of touching each other inside the insulated handle. Edited September 20, 2021 by Lou Schneider Quote Link to comment Share on other sites More sharing options...
Jaydrvr Posted September 20, 2021 Report Share Posted September 20, 2021 50 minutes ago, Lou Schneider said: Look at the pictures again, the two ends aren't connected and stop short of touching each other inside the insulated handle. Okay, THAT is cool! I missed that the first time around. Jay Quote Link to comment Share on other sites More sharing options...
Ray,IN Posted September 20, 2021 Report Share Posted September 20, 2021 5 hours ago, Lou Schneider said: Look at the pictures again, the two ends aren't connected and stop short of touching each other inside the insulated handle. Yep, not something a feet-on-the-ground mechanic would buy or use. Lineman's insulated tools must be inspected and tested on a regular basis to insure the insulation has not lost any insulating ability. It does remind me of my FIL when he was working for Indianapolis Power and Light. Time was not a factor when working up high; safety was paramount. Way too big and cumbersome for working in a MH battery compartment IMO. Quote 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
MNRon Posted September 20, 2021 Report Share Posted September 20, 2021 1 - I learned the lesson about wrenches around batteries at a young age when I welded a socket to a battery post accidentally in my teens. I’m VERY careful around high currents, even with low voltages, since. 2 - Some electronics require the negative cable to be connected *prior* to positive cable. I’ve seen the technical reason for this when involved in semiconductor manufacturing in the 1980’s. As a result I recommend others to be careful if in the practice of opening ground first…you may fry your $2k inverter or some other sensitive circuitry. 3 - A shut off switch wired in on the positive cable is always a good idea Quote Ron and Pat, and 2 Portuguese Water Dogs 2013 Silverado 3500 SRW Duramax w/SuperGlide 2005 NuWa HitchHiker DA 31.5 LK w/MorRyde IS Link to comment Share on other sites More sharing options...
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