AUX battery question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ericguy320 · 03-24-2004, 08:34 PM

i need to get the isolater or relay (not sure what its called) for the factory aux battery. I looked in old gm parts books but couldnt find anything, it says delco on it but no part numbers.

JimKshortstep4x4 · 03-24-2004, 09:35 PM

The relay for the auxillary battery is very simple. It has (3) wires connected to it and the case is grounded. Two of the wires go to the batteries, (one to each battery). The third wire goes to the fuse panel, ignition unfused. When the ignition switch is on the relay is pulled in and the two wires are connected, thus connecting the two batteries. When the ignition switch is off, the two batteries are not connected to each other.

I have the diagram in my assembly manual and I can fax you a
copy if you need it. Otherwise, someone may post it. I can look at a factory relay tomorrow to see if there is a number on it, if you like.

Otherwise you can buy a relay that will do what you need it to do.

Jim

ericguy320 · 03-24-2004, 10:51 PM

all of the parts and wires for mine are all still there i just could not find any place that had the relay. it says on the relay delco remy 920-12v

Mudder · 03-24-2004, 11:35 PM

Not trying to steal your thread but where is a good place for a second battery??? Would like to stay under the hood. And use a reagular tray for it?

RON WOODGEARD · 03-24-2004, 11:43 PM

The Auxillary battery relay looks just like a Ford Starter Relay,,, Don't mistake them though,, The Starter relay will burn out within a few minutes of Continous use.. The relay I bought, Was for a Horse Trailer. Some of the stores have no clue to what you want...
I wired mine up for a couple of different uses, One was to be able to start the vehicle off of the Aux. battery in case the Main goes down. I had a three way switch in the cab. Switch off, no connection to Aux. battery at all, Switch in left position, Aux. is connected when key is "ON" Switch in Right position, The Aux. battery is connected all of the time.

Longhorn Man · 03-25-2004, 08:15 AM

Hey mudder, the aux battery has a tray on the drivers side that looks very much like the passenger side one, a mirror immage, and just a little higher.

JimKshortstep4x4 · 03-25-2004, 12:07 PM

Mudder, Here is the way the factory tray mounts.

Jim

Mudder · 03-25-2004, 12:26 PM

Thanks guys.....

03-24-2004, 08:34 PM	#1
ericguy320 Registered User Join Date: Jan 2003 Location: Charlotte, NC Posts: 92	AUX battery question i need to get the isolater or relay (not sure what its called) for the factory aux battery. I looked in old gm parts books but couldnt find anything, it says delco on it but no part numbers. __________________ http://community.webshots.com/user/ericguy320 1972 Chevy C10 SOLD 1972 k5 blazer cst 350, sm465, rust 1993 gmc Typhoon for sale $13,900 obo 1980 Ironhead Sportster

03-24-2004, 10:51 PM	#3
ericguy320 Registered User Join Date: Jan 2003 Location: Charlotte, NC Posts: 92	all of the parts and wires for mine are all still there i just could not find any place that had the relay. it says on the relay delco remy 920-12v __________________ http://community.webshots.com/user/ericguy320 1972 Chevy C10 SOLD 1972 k5 blazer cst 350, sm465, rust 1993 gmc Typhoon for sale $13,900 obo 1980 Ironhead Sportster

03-25-2004, 12:07 PM	#7
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Mudder, Here is the way the factory tray mounts. Jim Attached Images

03-24-2004, 09:35 PM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	The relay for the auxillary battery is very simple. It has (3) wires connected to it and the case is grounded. Two of the wires go to the batteries, (one to each battery). The third wire goes to the fuse panel, ignition unfused. When the ignition switch is on the relay is pulled in and the two wires are connected, thus connecting the two batteries. When the ignition switch is off, the two batteries are not connected to each other. I have the diagram in my assembly manual and I can fax you a copy if you need it. Otherwise, someone may post it. I can look at a factory relay tomorrow to see if there is a number on it, if you like. Otherwise you can buy a relay that will do what you need it to do. Jim

03-24-2004, 11:35 PM	#4
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Not trying to steal your thread but where is a good place for a second battery??? Would like to stay under the hood. And use a reagular tray for it?

03-24-2004, 11:43 PM	#5
RON WOODGEARD Resident Young Old Dude ! Join Date: Jul 2001 Location: Nevada Posts: 1,948	The Auxillary battery relay looks just like a Ford Starter Relay,,, Don't mistake them though,, The Starter relay will burn out within a few minutes of Continous use.. The relay I bought, Was for a Horse Trailer. Some of the stores have no clue to what you want... I wired mine up for a couple of different uses, One was to be able to start the vehicle off of the Aux. battery in case the Main goes down. I had a three way switch in the cab. Switch off, no connection to Aux. battery at all, Switch in left position, Aux. is connected when key is "ON" Switch in Right position, The Aux. battery is connected all of the time.

03-25-2004, 08:15 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Hey mudder, the aux battery has a tray on the drivers side that looks very much like the passenger side one, a mirror immage, and just a little higher.

03-25-2004, 12:26 PM	#8
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Thanks guys.....



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