Keep blowing turn signal fuse - Chevy Impala SS Forum
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  • 1 Post By Fred Kiehl
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post #1 of 8 (permalink) Old 06-29-2018, 06:41 AM Thread Starter
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Keep blowing turn signal fuse

Just recently, I've started popping the turn signal fuse. Nothing has changed externally and all the bulbs work just fine. Its pretty random, too. Sometimes the fuse will stay for a week or more, sometimes it'll pop in a day. Before I start pulling the car apart, does anyone have any experience chasing this down or places to start looking first?

I swapped the flasher and the issue persists. I also pulled all the turn and tail lights to check the wiring and it all looks good.

Thanks


1995 Caprice ERE 383, CIA long tubes, Dynomax VT's, RAISS, Kore3/Z06 brakes, 3.42 posi, Boss 338 20's, 12 way seats, Impala SS console, etc etc etc
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post #2 of 8 (permalink) Old 06-29-2018, 07:56 AM
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You obviously have an intermittent short. It probably is a wire that has been worn, or pinched. Does it blow the fuse when the signal is working, or idle? If when it is idle, it is between the fuse and directional switch, because the directional switch is not making a circuit. If when working, and not when idle, it is between the switch, the flasher, and wiring to the lights. It could also be the switch itself. The wiring in the column is also suspect, although nothing overtly rubs it, it can rub against sharp edges.

With the information given, I can not determine whether or not to check the wiring between the flasher and the bulbs. Look for any wire that is against metal for insulation wear.
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1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
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post #3 of 8 (permalink) Old 06-29-2018, 11:05 AM Thread Starter
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Thanks Fred. I discovered something else today - it pops when I put it in reverse, and not every time I put it in reverse. I believe the switch that turns on the reverse lights is in the center console, correct?


1995 Caprice ERE 383, CIA long tubes, Dynomax VT's, RAISS, Kore3/Z06 brakes, 3.42 posi, Boss 338 20's, 12 way seats, Impala SS console, etc etc etc
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post #4 of 8 (permalink) Old 06-29-2018, 11:08 AM
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I believe that is true. It may have a short with the turn signal switch.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #5 of 8 (permalink) Old 06-29-2018, 12:15 PM
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Do you have a trailer plug? It is common to have problems where the wires are spliced or in the socket.



Quote:
it pops when I put it in reverse, and not every time I put it in reverse.
You could unplug the tail lights at the rear plug and see if the fuse still blows. This would rule out the tail lights. Easy to do with a sedan but harder to do with a wagon.

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post #6 of 8 (permalink) Old 06-29-2018, 12:32 PM
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One possibility (and something to protect even if it isn't damaged)


Take off the under dash panel and look up at the bottom of the steering steering column. There is a flat small-gauge wire harness that comes along the bottom of the tube. Has something like 8-10 wires, and the connector is several inches after it comes out of the column. The harness includes the turn/wiper/cruise stalk . You can see it slide back and forth when you tilt the wheel up and down, and you can see how it can easily rub a metal edge on the column every time. For me, the two leftside wires frayed at different times and would periodically short out and blow fuses, one for the wipers and one for the TS/brake lights. Splice repairing them was a pain because there's not much wire length to work with between the column exit and the connector
.

If yours are okay, then great, you can rule that source out, but I recommend adding some elec tape around the harness and a piece on the metal edge to prevent future chafing.
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post #7 of 8 (permalink) Old 07-01-2018, 09:49 AM
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Also check wiring going to that area. I had an issue with my Sedan where the fuel pump went out and burned up the ground wire. My lights acted strangely while my fuel pump worked fine (Might have had low pressure, did not check, but car ran fine). When I replaced the burned up ground wire everything went back to normal.
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post #8 of 8 (permalink) Old 07-05-2018, 09:18 AM Thread Starter
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For future searchers -
I checked the prndle switch at the base of the column and it was ok. I checked the wiring in the console and the signal switch and it was also ok.

The issue turned out to be the remote turn on for the rear-view camera which is not hooked up. This is wired-in to the reverse light circuit and the wire had chafed through the jacket. When the environment variables were correct, putting the car in reverse grounded out the line and blew the fuse. Located the wire, repaired it, ran it in a loom, and the problem appears to have been fixed.
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1995 Caprice ERE 383, CIA long tubes, Dynomax VT's, RAISS, Kore3/Z06 brakes, 3.42 posi, Boss 338 20's, 12 way seats, Impala SS console, etc etc etc
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