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Old 12-12-2013, 03:07 PM
CardinalFJ60's Avatar
CardinalFJ60 CardinalFJ60 is offline
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Default Dual battery solenoid (interim install)

I've got the batter tray, battery, and a solenoid ready to go in the LX. I'm waffling between NL, IBS, or a more simple marine switch setup. That said, I think for the time being, I want to wire up a 200a solenoid without the slick LED control panel. If this is possible, does this look right?

Here's my solenoid with markings on how to wire. (+ alt) is the main starting battery, the other (+) is the Aux, and of course (G) is ground. Can someone verify this'll be OK for the short term, until I decide what direction to go in for battery mgt?
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Old 12-12-2013, 05:28 PM
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DaveInDenver DaveInDenver is offline
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Does this particular isolator have a way to adjust the operating voltage? If it does /not/ (e.g. just a dumb solenoid) this you should connect the coil to an ignition hot signal or a switch otherwise the two batteries will always be connected. You might consider double redundancy, an ignition hot source then through a switch so that it doesn't try to parallel the batteries as you turn the key from off to run to start.

If there is some way to set at what point the solenoid works then this will be fine. You'd want to make it active when the alternator is working, so higher than 13.5V or something like that. When the alt stops the batteries shouldn't be higher than like 12.75V. It might be called a voltage sensing relay or similar. Just something that figures out if the engine is running or not before paralleling the batteries.

Make sense?

Seems right otherwise, (alt +) to alternator and starting battery, (+) to secondary household battery, (G) to ground.
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Old 12-13-2013, 08:22 PM
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This is the type of solenoid I used with my dual bat system. As Dave mentioned, I use the signal from the fuse box under the hood that is labeled ALT...so that the solenoid only connects the two batteries when the alternator has a signal. This way, the two batteries are completely separate when the vehicle is off. If I want them connected, I use a marine switch to tie the two together...in case I need to jumpstart myself.

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Old 12-13-2013, 08:38 PM
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Inukshuk Inukshuk is offline
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I see your problem right there - that big copper lug has no wire!
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1993 FZJ80 "enhanced", re-built Engine, and prototype GOBI Stealth roof rack
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