Weird Electrical Issue - Chevy Impala SS Forum
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post #1 of 14 (permalink) Old 12-04-2017, 01:31 PM Thread Starter
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Weird Electrical Issue

Hello everyone, I am having an odd electrical issue and Im hoping someone can help me out. I noticed the other day my instrument cluster lights would come on when I hit the brakes. I knew I had a few lights out so I changed all my exterior bulbs today just to make sure everything was 100%. I changed them with the standard OEM bulbs, not LED or anything like that. Heres where Im at....

Changed all bulbs and cleaned all grounds as well as the battery terminals. Also replaced the flasher just in case that has something to do with it.

Everything works correctly when I turn on the parking lights as well as the headlights

With headlights on everything on the passenger side works fine when I hit the passenger side turn signal.

With headlights on and i hit the brakes all is correct.

With the headlights off everything performs correctly when I hit the passenger side turn signal.

With the headlights off and I hit the drivers side turn signal the instrument cluster lights blink and all the turn signal lights blink as if the hazards are on.

With the headlights off and I hit the brakes the brake lights work fine but the instrument cluster lights up as well as the front parking lights.

Its acting like when I hit the brakes Im also turning on my parking lights. Anyone ever run into this? When I changed all the bulbs I checked all the wires best I could for any cuts and all looked good.

Thanks in advance for any help.
Matt

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post #2 of 14 (permalink) Old 12-04-2017, 02:15 PM
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Possibly a wire in column with insulation rubbed through. Check grounds. Including the braided strap from firewall to back of motor.

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post #3 of 14 (permalink) Old 12-04-2017, 02:43 PM
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Matt

Just like chasing a DMX issue in Lighting....its always cable/connector somewhere in the rig

Suspect wiring in column or brake pedal switch/wiring

From another LD....

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post #4 of 14 (permalink) Old 12-04-2017, 04:38 PM
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Sure does sound like a weird ground issue to me. I know you said you cleaned all the grounds. By all, did you also get the ones at the kick panel areas and the rad support? the ones at the kick panels are known to loosen up and also corrode.

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post #5 of 14 (permalink) Old 12-04-2017, 05:34 PM Thread Starter
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I have had to replace that column harness twice now. Im actually pretty good at it. Ill give that a try.

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post #6 of 14 (permalink) Old 12-04-2017, 05:35 PM Thread Starter
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I only cleaned the grounds right next to the battery and the one in the trunk. Where else should I be looking for the other grounds? Thanks

Matt MF'N Mills 96 Black SS NAISSO Member #6125
Mods: T-56, Suncoast Ram Air Hood, S-Class Mirror LEDs (thats right bitches), Smoothie Bumpers, 50% windshield tint, Train Horns, Clear Corner Lenses, Corvette Engine Dress, 2.5" Custom Exhaust, Carbon Fiber dash, Oil, Volt, and Vac gauges, 3 Gauge Pod, Body Bushing upgrade, T/B bypass, Red Bowtie, LT4 Knock Sensor, F-Body EGR valve & Servo, Moog suspension, A/C drip mod, SEM Blacked out interior, CIA Headers
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post #7 of 14 (permalink) Old 12-04-2017, 08:22 PM
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That is a classic ground fault. There are two grounds on the core support specifically for the lights. One on each side.

The problem ground causes the hot side to find an alternate path to ground, and in your case it is the lights.

If you have access to the FSM for your year, look at the ground/wiring for the side that is acting up. There might even be a trouble shooting guide in the FSM.

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post #8 of 14 (permalink) Old 12-04-2017, 09:33 PM
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post #9 of 14 (permalink) Old 12-05-2017, 06:26 AM
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Quote:
Originally Posted by Matt M View Post
I only cleaned the grounds right next to the battery and the one in the trunk. Where else should I be looking for the other grounds? Thanks
There are quite a bit more under the hood and in the car. The schematics up on....

A

....should show you most Circuits and each should indicate where specifically on the Car the Ground side is secured.

But from Memory, under the hood alone you have the HL grounds on the rad support kinda hidden away on the back side near the HL's. On the engine, there is a cluster of 4 or 5 on the Coil Mount Stud, 1 on the fender coming off the battery and another battery that goes to a stud directly above the timing cover.

In the car, there are quite a fewfor the Internal Lights and circuits that ar mounted directly to the body behind each kick panel. These are usually just secured with a Sheet Metal Screw and often times you get moisture in these areas from leaks.

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'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #10 of 14 (permalink) Old 12-05-2017, 07:22 AM Thread Starter
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This is great information. Thanks so much. Looks like ill be cleaning some more grounds.

Matt MF'N Mills 96 Black SS NAISSO Member #6125
Mods: T-56, Suncoast Ram Air Hood, S-Class Mirror LEDs (thats right bitches), Smoothie Bumpers, 50% windshield tint, Train Horns, Clear Corner Lenses, Corvette Engine Dress, 2.5" Custom Exhaust, Carbon Fiber dash, Oil, Volt, and Vac gauges, 3 Gauge Pod, Body Bushing upgrade, T/B bypass, Red Bowtie, LT4 Knock Sensor, F-Body EGR valve & Servo, Moog suspension, A/C drip mod, SEM Blacked out interior, CIA Headers
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