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battery disconnect info


jpar19

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Hi all. After using the search function and not finding what I need, I'll ask for help. I have a 2010 Volvo 630 VNL. The truck has an aftermarket (hot rod type) battery disconnect that doesn't seem to shut anything off. I would like to have the ability to shut the batteries as the truck sits a lot and runs the batteries down after just a couple days of sitting. The way it sits now the shut-off is in the positive cable but only one cable goes to it and one large positive cable goes to the batteries by-passing the shut off. Could someone peek under their truck and let me know how Volvo does it? Shouldn't everything go first to the shut-off, then to the batteries? I'd love to have the ability to preserve my batteries. Thanks for the help as always....

 

 

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I have never wired on the line but check to see if the one goes to the starter? If it does, it's okay because it will never pull power unless the starter solenoid is powered up. Check to see if the switch is bad. They are Flaming River switches and used on a lot of hot rods.

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Here is mine and I wired it just like you describe. Took the big red + cable wired to one side and carried same size cable to where original cable attached. Mine works just fine. Volvo trucks are "frame grounded" so it sounds like you've got a big parasitic draw somewhere. If you google parasitic draws and dig in it will tell you how to find out how much it is. Remember those little wires you see attached to the battery are still drawing some current all the time. Question two is have you checked the batteries themselves. Even one bad battery in the group will draw them all down.

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My truck only has three batteries. Should I add a fourth? I pulled the batteries out and I definitely have one bad one. I'm going to replace that one today and see if that changes anything. My battery disconnect doesnt seem to shut anything off. The truck will start regardless of what position the switch is in. I've just been removing the negative cables when it sits to avoid decharging. thanks for all the responses. I'll get to work and let you know how it goes

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Hi all. After using the search function and not finding what I need, I'll ask for help. I have a 2010 Volvo 630 VNL. The truck has an aftermarket (hot rod type) battery disconnect that doesn't seem to shut anything off. I would like to have the ability to shut the batteries as the truck sits a lot and runs the batteries down after just a couple days of sitting. The way it sits now the shut-off is in the positive cable but only one cable goes to it and one large positive cable goes to the batteries by-passing the shut off. Could someone peek under their truck and let me know how Volvo does it? Shouldn't everything go first to the shut-off, then to the batteries? I'd love to have the ability to preserve my batteries. Thanks for the help as always....

 

 

A bypassed disconnect will not disconnect. Wire it properly, then watch it work. Sounds like you've been bitten by the PO bug. The Previous Owner has made a bunch of decisions, which will make zero sense to you, or most people. They seemed perfectly logical at the time, but now? Oh boy! Many moons from now, you'll continue to find new ways all the PO's have conspired to make your life "interesting".

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My truck only has three batteries. Should I add a fourth? I pulled the batteries out and I definitely have one bad one. I'm going to replace that one today and see if that changes anything. My battery disconnect doesnt seem to shut anything off. The truck will start regardless of what position the switch is in. I've just been removing the negative cables when it sits to avoid decharging. thanks for all the responses. I'll get to work and let you know how it goes

 

Hi jpar,

 

My understanding is, if you have a bad battery you need to replace all of the batteries. The reason being is that the old batteries will take down your new battery. I know this is not what you wanted to hear. I hope you can find the problem with the truck.

 

Best of luck,

Al

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As to battery life and maintaining a charge. It is my understanding that batteries, after being put into service, will discharge 10% per month without ANY load. For that reason, I prefer to put a small solar panel on them when not used. I have a 20W on my TV. It does a good job of keeping batteries up and compensates for normal non-use exercise of batteries, which in theory should give me maximum life on those puppies.

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Hi jpar,

 

My understanding is, if you have a bad battery you need to replace all of the batteries. The reason being is that the old batteries will take down your new battery. I know this is not what you wanted to hear. I hope you can find the problem with the truck.

 

Best of luck,

Al

 

A second on this, when one needs to be replaced, the others are not far behind. You should always replace the entire set of batteries with new ones with roughly the same production date.

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I've always been a bit of a skeptic on the logic of replacing all batteries at once. Certainly, if they're all close to enf-of-life, it makes sense to do them all together as opposed to the headache of several replacement operations.

 

Just a few months ago, I replaced my chassis batteries--all 3 of them. But when I bought my rig, the batteries were old, and 2 tested bad. The seller replaced those two, and the three went a full 5 years from that point.

 

It just seems like the people who advocate batteries all being the same seem to also be people who sell batteries...

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So here's the update on what I found today. Removed all 3 batteries and had them load tested. Turns out the previous owner had replaced 2 of the three in 2015 but left 1 old battery in place. Turns out the old one had given up the ghost and was dragging down the whole system. I purchased one new battery and gave the remaining two a slow recharge. I'm sure their life span has been severely limited due to it's bad neighbor but I'll have to wait and see.

The previous owner or shop or whomever had taken the battery shut-off out of the circuit. They had all the connections going direct to the battery. So I cleaned all the connections and rewired everything to go through the shut-off on the positive side. Everything now seems to work as it should.

Thank you very much for all your help. I learn something new about this truck every time I lay my hands on it. It's so nice to have the wealth of information that you members provide. Thanks again.

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So here's the update on what I found today. Removed all 3 batteries and had them load tested. Turns out the previous owner had replaced 2 of the three in 2015 but left 1 old battery in place. Turns out the old one had given up the ghost and was dragging down the whole system. I purchased one new battery and gave the remaining two a slow recharge. I'm sure their life span has been severely limited due to it's bad neighbor but I'll have to wait and see.

The previous owner or shop or whomever had taken the battery shut-off out of the circuit. They had all the connections going direct to the battery. So I cleaned all the connections and rewired everything to go through the shut-off on the positive side. Everything now seems to work as it should.

Thank you very much for all your help. I learn something new about this truck every time I lay my hands on it. It's so nice to have the wealth of information that you members provide. Thanks again

I agree about the learning process. I am getting very good at hunting down gremlins on my HDT . . . . but then I enjoy hunting. I wonder If I can train my puppies to hunt gremlins? :rolleyes:

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