aux battery charge or not ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mtdave2 · 04-16-2003, 10:38 PM

im kind of puzzled here

my aux battery wasnt getting a charge. id meter it and it would be a 12 or less with the truck running... i checked every thing, didnt find a thing. i did replace that relay under the aux box...

now it meters at 12.98 when the truck is running... the main battery is at 14.05 .... wtf? is this normal? i would thing both should be getting the same charge.

btw the new internal alternator kicks major ass! easy conversion

JimKshortstep4x4 · 04-17-2003, 06:38 AM

I would suspect that you have some resistance in your wiring. The factory wiring is a pretty long route if you look at it. I would start at the battery and check the voltage at the terminals on the right fender to see if you can narrow it down where you are loosing the voltage. It could even be the ground wires on the left
side, whch should be checked, also.

Another way would be to use an ohm meter to check across the terminations, both positive and negative.

Jiim

mtdave2 · 04-17-2003, 09:25 PM

im not so sure that this isnt normal.... would someone with an aux battery go meter it for me?

04-16-2003, 10:38 PM	#1
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	aux battery charge or not ? im kind of puzzled here my aux battery wasnt getting a charge. id meter it and it would be a 12 or less with the truck running... i checked every thing, didnt find a thing. i did replace that relay under the aux box... now it meters at 12.98 when the truck is running... the main battery is at 14.05 .... wtf? is this normal? i would thing both should be getting the same charge. btw the new internal alternator kicks major ass! easy conversion __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

04-17-2003, 09:25 PM	#3
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	im not so sure that this isnt normal.... would someone with an aux battery go meter it for me? __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

04-17-2003, 06:38 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	I would suspect that you have some resistance in your wiring. The factory wiring is a pretty long route if you look at it. I would start at the battery and check the voltage at the terminals on the right fender to see if you can narrow it down where you are loosing the voltage. It could even be the ground wires on the left side, whch should be checked, also. Another way would be to use an ohm meter to check across the terminations, both positive and negative. Jiim



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