Trunk Battery Ford Solenoid Wiring Question - Team Camaro Tech
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post #1 of 18 (permalink) Old Feb 18th, 16, 03:39 PM Thread Starter
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Trunk Battery Ford Solenoid Wiring Question

Putting my Optima in the trunk for my LS3 swap. I put a Ford solenoid with it so I don't have a hot 1/0 gauge in the event of an accident or something. I asked a question about the size of the charge wire from the 150amp alternator back to the battery (this chart says use 0 gauge), most people use 8-6ga and ilikeike suggested 4 gauge if I was going to put amps and whatnot in the trunk (I am). But doesn't this kinda defeat the purpose of the Ford solenoid by having a large gauge hot wire?
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post #2 of 18 (permalink) Old Feb 18th, 16, 04:05 PM
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Re: Trunk Battery Ford Solenoid Wiring Question

If you use proper installation techniques you don't need the Ford relay. If you look at the way BMW and Volvo install their rear mounted batteries, you'll find that they run the cable directly from the battery through the interior of the car to a binding post in the engine bay. The cable is adequately shielded and protected by sheathing. I worry about the 10+ gallons of extremely flammable liquid I have in a metal tank in the rear of my car.

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post #3 of 18 (permalink) Old Feb 18th, 16, 04:20 PM
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Re: Trunk Battery Ford Solenoid Wiring Question

Use a fuse or circuit breaker in line

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post #4 of 18 (permalink) Old Feb 18th, 16, 05:36 PM
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Re: Trunk Battery Ford Solenoid Wiring Question

Quote:
Originally Posted by kabinet View Post
But doesn't this kinda defeat the purpose of the Ford solenoid by having a large gauge hot wire?
Yes!

With a 150amp alternator you should use a 6ga minimum for it work properly. Use a circuit breaker or fuse at the battery for the main feed wire. Any short will trip that. Any damage done with a 6ga wire will just as bad as a 1/0ga wire, either one will start a fire. And you have less wires and weight to deal with.

My new gen5 Camaro has the battery in the spare tire well and no Ferd solenoid anywhere to be found. That's 'factory'.

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post #5 of 18 (permalink) Old Feb 18th, 16, 05:45 PM
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Re: Trunk Battery Ford Solenoid Wiring Question

The solenoid is not intended for constant on. It will not last.

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post #6 of 18 (permalink) Old Feb 18th, 16, 05:47 PM
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Re: Trunk Battery Ford Solenoid Wiring Question

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Originally Posted by rp930 View Post
The solenoid is not intended for constant on. It will not last.
Solenoid is only on when cranking.

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post #7 of 18 (permalink) Old Feb 18th, 16, 05:50 PM Thread Starter
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Re: Trunk Battery Ford Solenoid Wiring Question

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Originally Posted by rp930 View Post
The solenoid is not intended for constant on. It will not last.
I was going to use the solenoid only when cranking so my 1/0 gauge would only be hot then but I would still have a hot 4 gauge from the alternator back to the battery. It will definitely save a lot of hassle routing all the wires back to the trunk if I don't use the Ford solenoid.
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post #8 of 18 (permalink) Old Feb 18th, 16, 07:44 PM
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Re: Trunk Battery Ford Solenoid Wiring Question

you don't need 4 ga from the alt to the battery for charging.

I run a #10 with fusible link. Lots of cars done that way and never an issue. I run AC, Amps with subs etc.

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post #9 of 18 (permalink) Old Feb 18th, 16, 07:57 PM
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Re: Trunk Battery Ford Solenoid Wiring Question

I did mine w/o the Ferdnoid - ran a 1/0 pos battery cable through the interior to a bulkhead connector under the heater box. Charge wire connects there - pos cable serves doubly duty as the charge wire from there to the batt


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post #10 of 18 (permalink) Old Feb 19th, 16, 03:45 AM
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Re: Trunk Battery Ford Solenoid Wiring Question

look at Mad Elec.
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post #11 of 18 (permalink) Old Feb 19th, 16, 03:50 AM
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Re: Trunk Battery Ford Solenoid Wiring Question

he also has all the parts to do the job call him nice guy 559 539 7128
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post #12 of 18 (permalink) Old Feb 19th, 16, 08:09 AM
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Re: Trunk Battery Ford Solenoid Wiring Question

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Originally Posted by kabinet View Post
I was going to use the solenoid only when cranking so my 1/0 gauge would only be hot then but I would still have a hot 4 gauge from the alternator back to the battery. It will definitely save a lot of hassle routing all the wires back to the trunk if I don't use the Ford solenoid.
Ok I misunderstood what you were trying to do.

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post #13 of 18 (permalink) Old Feb 19th, 16, 08:23 AM
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Re: Trunk Battery Ford Solenoid Wiring Question

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Originally Posted by DOUG G View Post
Use a fuse or circuit breaker in line
At which end, though? At the battery or alternator? Or both?

I'd be tempted to do both only because if the wire chaffs and shorts out either end would need a fuse to prevent a fire.

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post #14 of 18 (permalink) Old Feb 19th, 16, 08:43 AM
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Re: Trunk Battery Ford Solenoid Wiring Question

Use proper wiring techniques and you will not have any chafing. Don't run the wire over any sharp edges, don't stretch it tight, use plenty of sheathing, etc.
If you are in a wreck so violent that the insulation of a well protected slack wire running through the interior of the car is compromised, your battery has been destroyed in the process.

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post #15 of 18 (permalink) Old Feb 19th, 16, 10:00 AM
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Re: Trunk Battery Ford Solenoid Wiring Question

Quote:
Originally Posted by kabinet View Post
Putting my Optima in the trunk for my LS3 swap. I put a Ford solenoid with it so I don't have a hot 1/0 gauge in the event of an accident or something. I asked a question about the size of the charge wire from the 150amp alternator back to the battery (this chart says use 0 gauge), most people use 8-6ga and ilikeike suggested 4 gauge if I was going to put amps and whatnot in the trunk (I am). But doesn't this kinda defeat the purpose of the Ford solenoid by having a large gauge hot wire?
just 1 amp that I'll be using (when I get around to it)requires a 4g or larger to power it.

I ran a real 4000w in my wakeboard boat, and ran 1/0 from the alt to the battery bank to keep up.

I doubt I'll run anything I put in my camaro that hard,but I do have the gear sitting around so I may aswell use it. Also my friend is on the design team for Arc Audio,he'd give me sh!t if I didn't run his equipment to their standard.

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