Bad Ground? - Team Camaro Tech
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post #1 of 7 (permalink) Old Jul 8th, 07, 02:15 PM Thread Starter
amy
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Kevin
 
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Bad Ground?

On my 68, when I turn on blinker's my radio, and tach pulsate, radio light get's dim every time it blink's Have looked at most all ground's could it be anything else?
Thank's Kevin
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post #2 of 7 (permalink) Old Jul 8th, 07, 03:00 PM
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Re: Bad Ground?

you have your headlights on too I assume?
get a headlight kit from MAD electrical to solve your problem.
http://www.madelectrical.com/index.shtml
good read there too.
I bet it happens at idle too?

Drivers of old cars were accustomed to the lights dimming at idle, or the turn signals blinking slower–it was simply the result of low voltage when the alternator did not keep up. The older cars could get by with less than perfect performance. And with fewer electrical items to support, then the voltage did not drop off so quickly. The old cars also did not have electronics that would cease to operate at low voltage. With the duration of city traffic jams in modern times, the many accessories on a modern car, and electronics that are sensitive to low voltage, of course alternator output at engine idle speed had to get better. The newer designs of alternators can produce a lot more current at low RPM, even when the gross output rating is nearly the same with the old model.


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post #3 of 7 (permalink) Old Jul 8th, 07, 06:35 PM Thread Starter
amy
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Re: Bad Ground?

without engine runing, and haveing radio on, then turning 4way's on will cause it to dim light on radio, and move tach,turn lights on and will shut radio off for second. does same thing w/it running, GEN light doesn't come on?
Thank's
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post #4 of 7 (permalink) Old Jul 8th, 07, 06:52 PM
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Re: Bad Ground?

It could be a bad ground. Get a digital volt meter and measure the voltage between the battery (-) post (not the clamp), and the interior grounds (dash and chassis). You should see very little if any reading on the meter when you operate your accessories. If you're seeing more than 0.1 volts you've probably got a bad ground somewhere.

You can also repeat this test between the battery (+) and various hot spots in the car. Again, look for less than 0.1 volts drop when those accessories are on. If you see more than that, you've got a bad connection in the power feed for that circuit.

It helps to have a wire extender to reach from the battery to the interior. You may also need a helper to hold the battery connection while you test.

Dave
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post #5 of 7 (permalink) Old Jul 9th, 07, 08:49 AM
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Re: Bad Ground?

I second the bad ground suggestion. On my first Camaro I had the same problem. If I reached under the dash and jiggled the wires it would go away. Finally spent hours going through every ground connection; cleaning contact areas, etc. and was able to finally fix it.

Kevin

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post #6 of 7 (permalink) Old Jul 9th, 07, 09:29 AM
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Re: Bad Ground?

The main gauge cluster grounds using the screw in the center top position. Most of our cars have a broken gauge cluster because people tried to remove it without loosening the steering column bolts.
Check that ground first. I actually ran a replacement ground from the cluster to the dash reinforcement brace using a removable pigtail.

Steve
1968 that started life and a 6 banger with a PG. Now it's a 350 Holley Terminator EFI with a TKO600, Moser 12 bolt (3.73), Speedtech LCA/UCA, ATS AFX Spindles, Hotchkis Springs, Forgeline ZX3P, C5 (Kore3) brakes with other cool stuff.


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post #7 of 7 (permalink) Old Jul 9th, 07, 05:48 PM Thread Starter
amy
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Re: Bad Ground?

Thank's for replies, hopefully I'll get to it some night this week or it'll be there this weekend
Thanz again
Kevin
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