64 dash tach - Impala Tech
Troubleshooting Diagnosing problems

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post #1 of 5 (permalink) Old 11-16-2010, 09:51 AM Thread Starter
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Location: florida
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64 dash tach

cant find out why my headlight, taillights and signal indicators are slightly blinking when light switch is on, also 4way works but signals won't, gas gauge reads full but is not,horn is out also, any help, thanks in advance
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post #2 of 5 (permalink) Old 11-16-2010, 10:38 AM
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Sounds like an electrical problem. There is no one answer to this question. You will have to trouble shoot the affected circuits to find out where the electricity is going and why.

Since electricity can not be seen it has to be measured with a multi meter and a lot of time and effort. So much time and effort is involved in trouble shooting electronic problems so that no mechanic working for flat rate will touch it. A pro who specializes inm automotive wiring will yank everything out that is suspect and replace it with a new wiring harness, and charge an arm and leg in labor to do that, plus charge you list price plus 10% for the wiring harness for the privilage of letting them work on your car.

I recommend buying Tony Candela's book entitled "Automotive Wiring and Electrical Systems" ISBN 1-932494-87-7 as it explains the basics and offers points to look at that are frequent problems.

Big Dave
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post #3 of 5 (permalink) Old 11-16-2010, 03:55 PM Thread Starter
Join Date: Apr 2009
Location: florida
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i think it is something ive done because all systems were go before dis assembly, but the low energy blinking throughout the lighting system has to be something others have experienced, you have painted a bleak picture of the pro's out there, so i would like to try it myself, i will look into the book you suggest,if all else fails it will have to go to town, i just can't believe all this trouble for the tach which works perfect, thanks again
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post #4 of 5 (permalink) Old 11-16-2010, 05:27 PM
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Might give a shot at looking at the wire bundles that attach to the firewall on the engine side. Just a guess, but there is a power lead in one of them that is sometimes a problem for dropping power to the whole car. If it was arcing you might get the flickering light thing. It is worth a wiggle.

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post #5 of 5 (permalink) Old 11-17-2010, 08:21 AM
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A poor ground can cause weird problems so run a new ground to the dash if only temporarily
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