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02-05-2003, 09:16 PM
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#1 |
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Registered User
Join Date: Jan 2003
Location: Eufaula, OK
Posts: 19
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dash light problem
First, I just bought a 71 Custom 10 and I sure appreciate what a wealth of knowledge there is on this board. Already picked up a lot of good info.
But..... Here's one I haven't seen before. The dash lights on my '71 work but are real dim. I turn the knob all the way just short of the dome light coming on and they get a little brighter but still very dim. All external lights and signals work as advertised. Here's some possible clues. Both turn indicators come on (and stay on) when I turn on the lights, but the signals and flashers still work fine. The dash lights are even dimmer when the high beams are on. The dash was replaced with a tach dash (before I got the truck). I'm thinking it might be a printed circuit board problem? Any suggestions for troubleshooting further will be appreciated. Thanks, Kim
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71 Custom 10, LWB RED, RED, RED |
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02-06-2003, 09:56 AM
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#2 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Everything that you describe indicates a ground problem. The dash gets its ground through the connector that plugs into the dash. I would suggest adding a separate ground wire and attach it to the metal back of the dash.
Jim |
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02-06-2003, 10:16 AM
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#3 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Adding an additional ground wire is a good idea if that doesnt help you could always try new bulbs
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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02-06-2003, 01:06 PM
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#4 |
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Senior Moment
 
Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,095
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I had exact same problem. It was a ground on the circit board. I found it by accident when I grounded the unit while trying to figure it out. Just a loose ground, now they work PERFECT
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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02-09-2003, 11:16 PM
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#5 |
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Senior Member
Join Date: Dec 2002
Location: Portland, Oregon
Posts: 901
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I replaced the #194 lamps with #168 lamps which are 3 CP compared to 2 CP... ( 1/3 brighter! )... leave the headlamp ho/lo indicator lamp with the original 194 lamp...
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'71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal). |
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