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Faulty socket wiring problem Faulty flasher faulty switch
If you have a problem with the thermal switch, your fans will not come on at temperatures that will switch the fans to on in order to cool down the engine temperature. If you have a problem with the switch (faulty, burnt out), the only way to fix it is to replace it.
the relay is located within the hazzard flasher switch. If faulty replace flasher switch and it will sort out the problem
Check the safety switch. If the fuse for the Brake lights is blown it will also affect the safety switch; if the problem is intermittent then there is a possible short in the system or a faulty switch that needs replacement.
If you battery has plenty of power, either faulty contacts in ignition switch or starter motor, or faulty starter motor.
Yes, sometimes a faulty ignition switch can cause the engine to not fire. Also, a bad spark park can the engine to not fire.
That can be a problem with the fuse, the switch might be faulty. The motor at the transfer case might be unplugged.
Faulty Turn Signal flasher Faulty Turn Signal Switch
The most common causes of this problem you are having are a blown fuse; faulty headlight switch; or a short in trailer wiring. Check all fuses, look for damaged trailer wiring, and test the headlight switch. Correct any problems as needed. Sometimes a bad GEM module can cause this problem. If no other problems are found, consider the possibility of a faulty GEM module.
An old/worn/faulty light switch, or the wires connected to the switch are loose. Replace the switch ASAP.
My experience with a faulty ignition switch on this generation Regal include random warning lights coming on together and turning off at the same time. Eventually, the car will sometimes stall when the turn signal switch is used. This is due to the turn signal switch "bumping" the wires leading into the ignition switch. Apparently, the wire connections inside the ignition switch sometimes tend to loosen. Dealer cost runs around $350 to $400 to replace.
If the test switch is faulty then there is no convenient way to determine if the GFCI is functioning, and technically, if the test switch is faulty, then as it is a part of the GFCI, the GFCI is faulty and should be replaced.