License Plate Lamps Wont Work - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SRH916 · 03-26-2008, 10:12 PM

I have no idea what is wrong. I have used a tester grounded to the frame, and there is no power getting to the lights. Any possible ideas? Every other light works. I cant find where the wire goes though.

Thanks for the help, I really appreciate it,

Jared

babyJay · 03-26-2008, 10:45 PM

Most L.P. lights I have seen no working was due to poor grounding. Pull it out, brush it, and stick it back in, IF the bulb Ohm's out ok. If all else fails, run a new wire up to a tail light and tap into the harness. Just be careful not to tap into the brake/turn signal wire....

SRH916 · 03-26-2008, 10:47 PM

so the ground is the tail light itself?

babyJay · 03-26-2008, 10:50 PM

The one wire going to the bulb is 12 volts positive, the outside of the bulb lens casing, usually chrome, is the ground. That casing has to be touching the grounded part of the vehicle for it to work.

SRH916 · 03-27-2008, 12:17 AM

Thanks for the help, now that I know how that all works, I should be able to get it fixed.
I really appreciate that, now maybe I can drive after the sun goes down

Jared

03-26-2008, 10:12 PM	#1
SRH916 1975 C-10 Silverado LWB Join Date: Nov 2007 Location: Sacramento, CA Posts: 326	License Plate Lamps Wont Work I have no idea what is wrong. I have used a tester grounded to the frame, and there is no power getting to the lights. Any possible ideas? Every other light works. I cant find where the wire goes though. Thanks for the help, I really appreciate it, Jared __________________ 1975 LWB C-10 Silverado - Stock - "BIG 10" - 4 Bolt 350 "Brand new" 1200mi - THM-375 "Brand new w/trans cooler" 5000mi 1995 Ford Lightning - Bone Stock - 351W - Vortech??

03-26-2008, 10:45 PM	#2
babyJay Arrived on a Pale Horse Join Date: Mar 2007 Location: SnagTown Indiana Posts: 2,524	Re: License Plate Lamps Wont Work Most L.P. lights I have seen no working was due to poor grounding. Pull it out, brush it, and stick it back in, IF the bulb Ohm's out ok. If all else fails, run a new wire up to a tail light and tap into the harness. Just be careful not to tap into the brake/turn signal wire.... __________________ Jason 87 V30 350TBI/400 White w/Boss V-plow 89 R3500 CC SRW

03-26-2008, 10:47 PM	#3
SRH916 1975 C-10 Silverado LWB Join Date: Nov 2007 Location: Sacramento, CA Posts: 326	Re: License Plate Lamps Wont Work so the ground is the tail light itself? __________________ 1975 LWB C-10 Silverado - Stock - "BIG 10" - 4 Bolt 350 "Brand new" 1200mi - THM-375 "Brand new w/trans cooler" 5000mi 1995 Ford Lightning - Bone Stock - 351W - Vortech??

03-26-2008, 10:50 PM	#4
babyJay Arrived on a Pale Horse Join Date: Mar 2007 Location: SnagTown Indiana Posts: 2,524	Re: License Plate Lamps Wont Work The one wire going to the bulb is 12 volts positive, the outside of the bulb lens casing, usually chrome, is the ground. That casing has to be touching the grounded part of the vehicle for it to work. __________________ Jason 87 V30 350TBI/400 White w/Boss V-plow 89 R3500 CC SRW

03-27-2008, 12:17 AM	#5
SRH916 1975 C-10 Silverado LWB Join Date: Nov 2007 Location: Sacramento, CA Posts: 326	Re: License Plate Lamps Wont Work Thanks for the help, now that I know how that all works, I should be able to get it fixed. I really appreciate that, now maybe I can drive after the sun goes down Jared __________________ 1975 LWB C-10 Silverado - Stock - "BIG 10" - 4 Bolt 350 "Brand new" 1200mi - THM-375 "Brand new w/trans cooler" 5000mi 1995 Ford Lightning - Bone Stock - 351W - Vortech??

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