ARGO Posted December 23, 2018 Report Share Posted December 23, 2018 As I posted earlier, my alternator went bad. (Delco 33si) Got a new one installed, lost the pic I took before removal showing a small jumper wire between 2 of the posts. Can anybody take a pic of theirs for me? Pos & Neg no problem, but the wire doesn't show on Delco's diagram. Really don't want to fry the new one. Mine's in a 2000VNL W/Cummins N14, but jumper probably on any big alternator. Tks! You'd have to see the movie to understand.......... Link to comment Share on other sites More sharing options...
Jaydrvr Posted December 23, 2018 Report Share Posted December 23, 2018 13 minutes ago, ARGO said: As I posted earlier, my alternator went bad. (Delco 33si) Got a new one installed, lost the pic I took before removal showing a small jumper wire between 2 of the posts. Can anybody take a pic of theirs for me? Pos & Neg no problem, but the wire doesn't show on Delco's diagram. Really don't want to fry the new one. Mine's in a 2000VNL W/Cummins N14, but jumper probably on any big alternator. Tks! That's most likely the battery voltage sense wire. Without it, you won't trash the new alternator, but at max voltage output you WILL fry your batteries. I'm not near my truck at the moment so I can't take a picture, but the info should be online. I'll check that when I have a chance. Jay Link to comment Share on other sites More sharing options...
Jaydrvr Posted December 23, 2018 Report Share Posted December 23, 2018 If it's an actual 33si, their website says it doesn't have a sense terminal. If that's the case, you would leave it off, as the regulator is preset and not charging based on battery condition. Check the output voltage while running and under load and it should be around 14.4 vdc. Jay Link to comment Share on other sites More sharing options...
ARGO Posted December 23, 2018 Author Report Share Posted December 23, 2018 Actually, it WAS a 33si. Delco said replace it with a 36si, which does have the fourth post for the battery sensor & more amps. This wire looks like a fusible link, w/ a lump in it, was on the 33. Tks! You'd have to see the movie to understand.......... Link to comment Share on other sites More sharing options...
Wrknrvr Posted December 23, 2018 Report Share Posted December 23, 2018 Link to comment Share on other sites More sharing options...
Ronbo Posted December 24, 2018 Report Share Posted December 24, 2018 This will show you where the sense wire goes. http://www.delcoremy.com/Documents/Alternator-Instruction-Sheets/INSTALLATION-INSTRUCTIONS-33SI,-34SI,-35SI-36SI.aspx Ron C. 2013 Dynamax Trilogy 3850 D3 2000 Kenworth T2000 Optimus Prime Link to comment Share on other sites More sharing options...
ARGO Posted December 26, 2018 Author Report Share Posted December 26, 2018 Now THAT'S my Christmas present! TKS! You'd have to see the movie to understand.......... Link to comment Share on other sites More sharing options...
Jaydrvr Posted December 26, 2018 Report Share Posted December 26, 2018 On 12/23/2018 at 3:59 PM, Wrknrvr said: If it's like this, that looks like a capacitor for noise reduction and not related to performance. Link to comment Share on other sites More sharing options...
ARGO Posted December 26, 2018 Author Report Share Posted December 26, 2018 I can't tell by the pic if the other end of the "link-looking" wire comes out of the loom, or is loose & goes to case. Mine is a loose wire, eyelet on each end. Does it matter which end goes to + ? You'd have to see the movie to understand.......... Link to comment Share on other sites More sharing options...
Wrknrvr Posted December 27, 2018 Report Share Posted December 27, 2018 I can take look tomorrow am. I am sure the wire is only connected as shown. And not in the loom. But will check in the am. Note the color of wire on the ends. I will check in the am in Arizona time then post. Vern Link to comment Share on other sites More sharing options...
ARGO Posted December 27, 2018 Author Report Share Posted December 27, 2018 After I wiped the dirt off the wire, I see it is red & white, so that's the hookup. Tks for all the help. My new alt has the remote sense post, but the pos wire shows direct connectivity to the + post of the battery. Waiting for Delco to call me back, thought I saw I could connect the + wire to the remote post in that case. You'd have to see the movie to understand.......... Link to comment Share on other sites More sharing options...
Wrknrvr Posted December 27, 2018 Report Share Posted December 27, 2018 I forgot about the new picture till now. See you figured it out. My bad for not getting that picture. I was out working and just got back inside to warm up. And realized I forgot. Now last summer I worked on a Monaco Motorhome and found that they sensed the voltage at the battery side of a battery isolator. About 8' of wire to the isolator from the alternator. That wire that went from the isolator to the battery tested at about 14.1 vdc The alternator side of the islolator was well over 15 volts. Safe Travels Vern Link to comment Share on other sites More sharing options...
Sehc Posted January 3, 2019 Report Share Posted January 3, 2019 Different vehicle, other than the ground. I had a battery wire and two small sense wires. I got them backward. The new alternator would not charge. Swapped the two and all is well. No harm done. Link to comment Share on other sites More sharing options...
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