1977 Chevy K10 Printed Circuit Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NW Task Force · 12-06-2020, 03:35 PM

I am replacing the original printed circuit on the backside of the dash cluster. My truck is a factory 4wd K10 and has the 4-Wheel Lock indicator light on the dash. This light has never worked and did have a bulb socket plugged into it. My question is: The replacement printed circuit does not have exposed copper ring for a light bulb to work. My stock printed circuit also looks like the copper ring around the bulb hole is non existent. Without this copper ring to make the connection for the light bulb, how can it possibly work?

kipps · 12-06-2020, 11:06 PM

I'm sure the plastic can be peeled back to expose the copper if you want it to work.

Do you have the necessary wiring coming from the transfer case?

ray_mcavoy · 12-08-2020, 08:16 PM

Although the printed circuit has traces leading to that bulb location, they weren't actually used for the 4 wheel drive indicator light.

Instead, the 4 wheel drive indicator light uses a bulb socket with it's own wires. If you look around in the dash you should find a bulb in a plastic socket with 2 wires (white and brown with a white stripe according to the factory wiring diagram).

12-06-2020, 03:35 PM	#1
NW Task Force Registered User Join Date: Feb 2011 Location: Poulsbo, WA USA Posts: 247	1977 Chevy K10 Printed Circuit Question I am replacing the original printed circuit on the backside of the dash cluster. My truck is a factory 4wd K10 and has the 4-Wheel Lock indicator light on the dash. This light has never worked and did have a bulb socket plugged into it. My question is: The replacement printed circuit does not have exposed copper ring for a light bulb to work. My stock printed circuit also looks like the copper ring around the bulb hole is non existent. Without this copper ring to make the connection for the light bulb, how can it possibly work? Attached Images __________________ 1957 Chevy Pickup 1/2T, stepside, big window, 77' Camaro subframe, 3rd gen Firebird rearend w/3.23 gears & disc brakes, 66' 283cid, TH350 auto, everything else is original

12-06-2020, 11:06 PM	#2
kipps Registered User Join Date: Jul 2014 Location: North-central Virginia Posts: 1,104	Re: 1977 Chevy K10 Printed Circuit Question I'm sure the plastic can be peeled back to expose the copper if you want it to work. Do you have the necessary wiring coming from the transfer case? __________________ 1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome!

12-08-2020, 08:16 PM	#3
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,366	Re: 1977 Chevy K10 Printed Circuit Question Although the printed circuit has traces leading to that bulb location, they weren't actually used for the 4 wheel drive indicator light. Instead, the 4 wheel drive indicator light uses a bulb socket with it's own wires. If you look around in the dash you should find a bulb in a plastic socket with 2 wires (white and brown with a white stripe according to the factory wiring diagram).



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