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  #1  
Old 04-21-2016, 09:58 PM
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Have 3 batteries in series for 36v

Tried grounding 4th battery which is not connected to hydraulic batteries to trunk ground.

Front engine bay ground got red hot.

Upgraded to 1/0 in engine bay.

Rear 4awg ground got hot, smoking electrical tape, throwing mad sparks when touched to chassis ground in trunk.

What is going on?

Is it possible to have hydraulics and beat at the same time?

If so, how do you go about wiring an extra battery in the trunk for beat along with 3 batteries that are for hydraulics?

No, I'm not trying to hook up the 3 series batteries that are 36v to the 12v stereo system.

I'm guessing I need an isolator of some sort?


Also, it was working fine with an hc600 wired the same way, but we swapped out the hc600 for a big 850cca lead acid and that's when the problems started.

Oh and the series batteries were grounded to the chassis and I thought that was a bad idea.

Do hydraulic batteries need to be grounded to chassis? They are not being charged so I assume not, and that's why the wire is messing up.
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Last edited by graham; 04-21-2016 at 10:08 PM.
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  #2  
Old 04-21-2016, 10:25 PM
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your problem lies elsewhere, as long as the positives aren't in parallel or touching in any way to the stock system you'll be fine.

the grounds can all be on the chassis, without issues, according to the laws of physics.
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Old 04-21-2016, 10:39 PM
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Quote:
Originally Posted by mitchell0715 View Post
your problem lies elsewhere, as long as the positives aren't in parallel or touching in any way to the stock system you'll be fine.

the grounds can all be on the chassis, without issues, according to the laws of physics.
But if they were parallel then I could just wire them to the alternator and amp and what not, couldn't I?

Do I just connect the last ground in the set of batteries to the chassis ground? That's how it's connected now and it's not working.

Do you even need to chassis ground hydraulic systems?

Not gonna lie, the hydraulic wiring is a bit of a mess so I can't really say if it's correct or not...hard to say. I just know my car audio wiring is legit...gotta be something to do with the hydraulics
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Old 04-21-2016, 10:40 PM
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Early 4th of July huh lol
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Old 04-21-2016, 10:47 PM
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Quote:
Originally Posted by graham View Post
But if they were parallel then I could just wire them to the alternator and amp and what not, couldn't I?

Do I just connect the last ground in the set of batteries to the chassis ground? That's how it's connected now and it's not working.

Do you even need to chassis ground hydraulic systems?

Not gonna lie, the hydraulic wiring is a bit of a mess so I can't really say if it's correct or not...hard to say. I just know my car audio wiring is legit...gotta be something to do with the hydraulics
hell to the **** NO!

do NOT connect a complete circuit with two different voltage systems in parallel. having them share a ground is one thing, having them share the entire circuit is a completely different thing

i dont know why you have a problem.
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Old 04-21-2016, 10:58 PM
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IF you do not ground to frame, make sure you remember that you have a FLOATING Ground in your car. Do not ever allow anything including your body to touch anything coming from ground on that 36v bank to frame of car if you leave it like that.

Assuming batt 1 is power and batt 3 is ground, if you can't figure it out, need an ammeter to track down what is going on.
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Old 04-21-2016, 11:52 PM
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yes u can......
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Old 04-21-2016, 11:55 PM
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you can parallel the last two batteries before the ground, the alt can charge the two in parallel.the one further down the chain is unefffected 24 volt 36 vole 48 etc....

the ground should attached to the rack via a quick disconnect then rack should be welded to frame..
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Old 04-22-2016, 01:48 AM
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Originally Posted by rocksolid84 View Post
you can parallel the last two batteries before the ground, the alt can charge the two in parallel.the one further down the chain is unefffected 24 volt 36 vole 48 etc....

the ground should attached to the rack via a quick disconnect then rack should be welded to frame..
Working on the same car pretty much lol.

I don't get it though.

We just want one extra battery for amps and 3 for hydros.

it's already grounded to the rack via the bolt holding all the batteries down.

I don't assume the first battery (for audio) being also in the same battery rack could be grounding itself that way?

I'll get to get some pics.

basically just 4 in a row, first one directly connected to front battery via welding 1/0 and grounded with 4awg 2' to trunk chassis.

next 3 up to 36v.

what would cause the arcing when grounding the first battery to trunk chassis?
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Old 04-22-2016, 03:42 AM
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Like mitchell said - you can share a ground plane amongst different voltages but the rest of either circuit must be isolated. It sounds like a wire somewhere in the 36v bank is grounded and creating a reverse polarity short to the 12v system. It would be like taking two batteries and connecting the positive of one to the negative of the other and vice-versa - you just get a big short.
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