turn signal power draw

Asked by 1Gregory1 Mar 24, 2020 at 02:29 PM about the 1998 Chevrolet Prizm

Question type: Maintenance & Repair


When turn signals are used, lights dim & rpm drops with each blink on my
96, not a 98 Geo Prizm.  What would cause this?

Thank you

6 Answers


I would check out your battery and alternator.

1 people found this helpful.

That's right, most voltage variations are linked to a weak alternator or a battery that is borderline on testing, but age of wiring also can be an issue, so check for any corrosion and make sure the grounds are clean and tight on your lighting circuits and your charging system.

1 people found this helpful.

The battery is new, but the alternator has been on for quite some time. I'm guessing the last time i replaced it was around 150,000 miles ago. My car has 306,700 and run great otherwise. Had it since it was new. I do all the maintenance on it, but I will check over connections and see how things are. Thank you!


Yeah, that old and with that kind of mileage wiring could be an issue as well as the alternator just getting tired. If you do find corrosion deep inside the wiring you could switch over to LED bulbs until you can find time to rewire the circuits. They draw a lot less current and may get you by until your ready.

1 people found this helpful.

Resolved the issue. Turned out the belt just had to be tightened a little bit. However, with the second alternator having over 150,000 miles on it, I'm sure it might be getting a little tired too. Thank you for your input.

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