1969 Chevelle Dash Ground Gremlins
- The gas gauge needle dips when the headlights are turned on.
- The high beam blue light sometimes works, sometime doesn't.
- The dome light intensity varies.
- Both turn signals will "glow" with varying intensity.
- The gauge lights' intensity varies.
- The windshield wipers usually work normally, but every once in a while will go at fast speed when the switch is in the slow position, and when the switch is in fast position, the wipers will park and then then jerk up and down in the park position. When this happens, the high beam blue light is bright even with the headlights in the low beam position or off.
- If I push really hard on the plastic dash carrier directly to the left of the head light switch or wiper switch. Sometimes this completely cures the symptoms, but only for a short while. This usually gets things working about 80% correctly. Every rare while, I have to push on that spot hard and repeatedly so that the wipers aren't acting as if they're possessed.
- Sometimes, if I open and slam closed the glove box door things will improve.
- Bad ground. I believe that the dash ground strap that houses the wiper and headlight switches isn't secure. I've tightened the one bolt above the headlight switch behind the dash and it cured everything for a few months, but then the problems came back. Next, I'm going to make sure that the three bolts for the wiper switch are tight, although I doubt that's the problem as the switch itself has no wiggle to it. I looked at the plastic dash carrier mounting screws in front and all of them are present except for the top left. The dash carrier is probably aftermarket and that hole doesn't quite line up with the hole in metal dash frame. The top hole of dash ground strap is probably unsecured and the dash strap is making partial and intermittent contact with the metal dash frame, creating a poor or non-existent ground.
Possible permanent cures:
- I could drill a new hole in the aftermarket plastic dash carrier to line up with the factory hole in the metal dash frame and insert a screw. That may not work if the dash ground strap isn't lining up with the hole in the metal dash frame.
- See if I could wedge a washer or any other piece of metal between the top of the dash ground strap and dash metal frame to bridge the gap and create a strong ground.
- To avoid any marring of the aftermarket plastic dash carrier, I could run a ground wire from any hole in the dash ground strap (wiper mounting bolt, etc) to a solid spot on the frame.
Any opinions on whether the diagnoses is correct and what the correct fix is? Thanks for any insights.
Last edited by 658Chevy; Feb 21st, 16 at 6:07 PM.