Blinkers work randomly. Have been advised that it may be the "blinker can". Does this sound correct or could it have a number of causes? If it is the blinker can, do I need to remove the dash to replace it and is it an easy job? In short, would I be wasting money buying a blinker can and trying to do the job myself (pretty hopeless myself) or should I just take it to an auto electrician?
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Re: 1990 Corolla blinkers working intermittently only
If the flasher ("blinker can") was bad, It would be rare that it would work intermittantly. We rarely change the fashers, they are pretty reliable. My suggestion to you is to check your turn signal switch. If the signals are not flashing, cycle the switch back to center & left/right; hold it in the "on position".... Do the lights the start to work? if so, replace the turn signal switch.
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blinkers sounds like the flasher unit is not working. It's located under dash. Also check for burnt out bulbs.
Rear defrost, or rear defogger?: Your defogger for the rear window would run off a relay, probably located in the fuse panel of your car. Often, the connections at the rear window get broke or disconnected.
Front defrost: does your heater blower work?
The turn signal socket, where the bulbs are fitted, needs to be inspected.Also the wiring needs to be inspected.Wiggle the socket and wiring a bit, then check, if the blinkers start working or not.----------
There is a troubleshooting procedure to confirm the fault,Click this link below and go through the procedure :---
This will help.Thanks.Helpmech.
The right blinker issue sounds like you have one bulb out either front or rear check them both. The left blinker issue sounds like either bulbs(both out) or fuse, or worst case blinker switch has gone bad on left turn only so not picking up the signal.
First check if the bulbs haven't got fused, then check the fuse for the blinkers, finally the alternator which is responsible for the blinking. Its contact points to be cleaned of any carbon coating..................sodeep