Blinking Test light on rear window
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New User
Joined: Sep 2004
Posts: 23
Likes: 0
Blinking Test light on rear window
I've replaced the dash switch and fixed the window motor (runs when hooked direct to battery) all fuses are good. Still won't turn motor. When I use a test light starting at dash switch I have solid light at the power and at the switch legs when they're activated. I move to the back starting at the connector behind the drivers side tail light I get a flashing test light through out the harness in the tailgate, doesn't matter gate up or down, key does have to be in on position. I think the safety has already been bypassed (wires connected together near gate handle)? Any ideas as to what might cause the flashing?
1978 Bronco
1978 Bronco
Senior User
Joined: Apr 2004
Posts: 443
Likes: 1
From: Central Va.
Year???? always helps.Are you sure-this is wires in tg- Sounds as you are testing wrong wire- fuel sending wire pulses when checking on some years if i remember right.Try the latch switch on the drivers side of tailgate- unplug and jumper it with a wire.Note- tailgate open, watch glass if it works don't let it move too far out!!!
Elder User
Joined: Apr 2002
Posts: 813
Likes: 0
From: NJ
i believe there is a circuit breaker that is instead of a fuse. the breaker seems like it may be worn out and cant handle the current that is needed to operate the motor. how fast is the blink? is it on for a few seconds or is it a real fast blink?
Senior User
Joined: Apr 2004
Posts: 443
Likes: 1
From: Central Va.
My 78 had the circuit breaker mounted right off of starter solenoid stud- does power pulse off off this and is it VERY hot to touch??Wires run inside of frame down drivers side and window power wire is a large guage wire(12guage??) cause I used this to also power my brakeaway battery on my trailer.Anyways never seen a circuit breaker blink like a flasher for more than a couple of seconds- they break current when a short to ground happens and reset themselves when the short is gone-after awhile they weakin and kill juice before it gets to the orig. amp setting they were designed for.(example internal circuit breaker in headlight switch- can handle low beam but can't handle high beam for too long)
