The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Mystery wire on 66 C10 with delux heater and AC

**spudder** · 04-09-2013, 07:04 AM

GM vehicles used a brown wire for power to the the heater. The heater should have a dedicated fuse at the fuse block where the brown wire picks up it's power.
The wire you have pictured is for a cigarette lighter. Lighters of that era had a pin on the the receptacle that the wire end pushed onto. Lighters were powered form a "battery fused" source on the fuse block. This provided constant power to the lighter even when the ignition was off.

04-09-2013, 07:04 AM	#5
spudder Active Member Join Date: Aug 2012 Location: Central Illinois Posts: 103	Re: Mystery wire on 66 C10 with delux heater and AC GM vehicles used a brown wire for power to the the heater. The heater should have a dedicated fuse at the fuse block where the brown wire picks up it's power. The wire you have pictured is for a cigarette lighter. Lighters of that era had a pin on the the receptacle that the wire end pushed onto. Lighters were powered form a "battery fused" source on the fuse block. This provided constant power to the lighter even when the ignition was off.