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Turn signal flashing fast

481 Views 1 Reply 2 Participants Last post by  bjc789
I have a 1996 Seville STS and the left turn signal is flashing very fast. Both the front and the rear are working just much faster than the right. Every once in a while when I turn the left signal on, it will just freeze the left and the rear bulbs in the on position. After I turn it off and on again it goes back to blinking fast. Any ideas? Thanks!
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Bad bulb or wiring or internal contact on the signal switch that creates either too much or too little resistance for the flasher to work properly. Right side works ok, right? This points away from the flasher unit itself.

On a bimetallic flasher it needs the correct amount of current to flash at the correct rate, since it is constantly heating and cooling a bimetal strip, which makes and breaks the circuit. It is very sensitive to circuit load. Fast flashing indicates over current. No flashing indicates low current.

An electronic flasher unit has an internal circuit which doesn’t rely on the external load to determine it’s flash rate.

I’m not sure which one you’re supposed to have.

Lamps can get shorted but still light up. Wiring can have a partial pathway to ground. Both these things increase current.

But, because you said it will sometimes not flash at all, it seems to me that there is likely a problem inside the signal switch itself.

A person has to pull the steering wheel to get access to that switch. Not an insignificant job.

Should also check for DTC’s.

That should get you going on troubleshooting.
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