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dual Battery Setup

jstout

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Dec 2, 2004
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Charlotte, NC
Ive got a 88 K-5 Blazer Ive got the tray and all I need to find is a good wiring setup/Isolator. any one know of any
 
Painless Wiring makes a nice setup that allows you to control the second battery..isolate or combine. Its about $80, they also have it in a waterproof version for like $150.

I plan on gettin the regular kit sometime soon.

40102.jpg
 
jstout said:
Ive got a 88 K-5 Blazer Ive got the tray and all I need to find is a good wiring setup/Isolator. any one know of any

Just wire your batteries in parallel.
 
perko makes a very simple switch to wire. for marine set ups but i have one and I love it. cheap to!
 
Isolators produce voltage drop, go with the Painless setup, it uses a constant duty solenoid. Hell, if you can find a good solenoid, you can wire your own setup. Besides, if you run a perko marine switch you'll be running all of the current in the vehicle into the passenger compartment.
 
Why would you run a #4 wire to the battery, and a #2 wire from there to the starter? Seems counterproductive to me, despite that one run being fairly short. I went #2 all around, even on the aux. battery and never looked back.

Then again, mine are in parallel, never had any issues with that either.
 
Burt4x4 said:
Who knows why he (Hellroaring) has that #4 there??:confused: I used #2 for all my cables:D

Sounds good. I suspect they figured the isolator was going to be close to the battery, so a short run of smaller wire was ok. That said, I don't like that idea, and I prefer to see #2 or bigger everywhere...it really can never be too big when you're talking about that much current @ 12v.
 
84_Chevy_K10 said:
Why would you run a #4 wire to the battery, and a #2 wire from there to the starter?

I'm guessing it's because that #4 wire, according to the posted Hellroaring pic, is running to the backup battery.
I agree with you though, if it were mine I'd run #2 or better all around, especially with a winch and/or a diesel.
 

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