94 LeSabre headlight/dashboard flicker

[DrDirt181944]

Have a '94 LeSabre that always starts when cold. However, when I turn on the headlights, the car almost dies but then returns to normal RPMs in just a few seconds. Then, both the headlights and dashboard lights constantly flicker while the headlights are turned on. The alternator and battery have both been checked and are OK. Any ideas as to what may cause this? Thanks

[HotZ28]

Have you removed the positive battery cable rubber insulation and inspected the area between the cable and spacer on both sides. (Be sure to remove the negative cable first)! This is a very common problem on these cars with piggyback side mount cables. In fact, both cables should have the rubber insulation removed for inspection. If you see corrosion in this area, use a 25/75 combination of baking soda and water with a brass brush to thoroughly clean everything on both sides. Once you have all this clean & tight, if the problem still persist, it is time for a new ECU. Voltage spikes can easily damage the ECU. i.e. bad battery connections, or cables.

I found a permanent fix for the terminal dilemma on all my GM cars by replacing the terminals with heavy-duty soldered terminals and gold plated battery post. Never had a problem since!

See pics below:

[DrDirt181944]

I will try that in the morning. Thanks so much for the quick response.

[DrDirt181944]

Cleaned the positive terminal and connection on the battery and the problem is solved. Thank you for the quick and easy solution.

[HotZ28]

Thanks for the feedback. Sorry, but I forgot to mention, once you have everything clean, apply a liberal coating of dielectric grease to all surfaces, otherwise the original problem will reappear in a few months. You can find dielectric grease at any auto parts supply. Remember; always remove the negative (-) terminal first.