Firewall Relay Question ??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevy garage · 02-16-2003, 11:29 PM

There is a small relay on the firewall of my 70 C-10. It is located to the left of the distributor facing the firewall. Every time I hook up the battery is starts clicking. Nothing is on inside the truck. My new battery keeps going down and I don't know what this relay is. If anyone has any ideas let me know. I think it is drawing down my battery but I don't know what the relay is for. My 68 Camaro and 72 Cutlass don't have these relays. Any help would be greatly appreciated.

Thanks
Chevy Garage

Longhorn Man · 02-17-2003, 12:56 AM

Try unplugging it. It isn't stock, so it shouldn't bother the normal operation. Maybe even follow the wires?

da-burb · 02-17-2003, 01:07 AM

That should be for emissions. It controlled a valve mounted on your manifold that would allow or not allow vacuum to your distributor. I have seen several 70's with this. Unplug it and see if your problem goes away.

The other thing I always check first is the horn relay. Does your horn work? If it doesn't it could be the horn relay and it generally takes about 3 days to drain a battery.

02-16-2003, 11:29 PM	#1
chevy garage Registered User Join Date: Aug 2002 Location: Maryville, TN Posts: 239	Firewall Relay Question ??? There is a small relay on the firewall of my 70 C-10. It is located to the left of the distributor facing the firewall. Every time I hook up the battery is starts clicking. Nothing is on inside the truck. My new battery keeps going down and I don't know what this relay is. If anyone has any ideas let me know. I think it is drawing down my battery but I don't know what the relay is for. My 68 Camaro and 72 Cutlass don't have these relays. Any help would be greatly appreciated. Thanks Chevy Garage

02-17-2003, 01:07 AM	#3
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	That should be for emissions. It controlled a valve mounted on your manifold that would allow or not allow vacuum to your distributor. I have seen several 70's with this. Unplug it and see if your problem goes away. The other thing I always check first is the horn relay. Does your horn work? If it doesn't it could be the horn relay and it generally takes about 3 days to drain a battery. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

02-17-2003, 12:56 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Try unplugging it. It isn't stock, so it shouldn't bother the normal operation. Maybe even follow the wires?



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