1990 Ford Bronco Malfunction - Windows & Glass

Question: 1990 Ford Bronco rear window does not go down by using Tailgate Key Switch; window operates normally from the dash mounted switch. I have replaced Tailgate Wiring Harness (second time *) and electrically jumped (bypassed) the Tailgate Latch Switch. The down operation fails with both the key and by physically pressing with the finger, the normal audible click is heard when the switch is depressed. (* The first time I replaced the harness was 2 weeks ago, the window operated for a short time in both directions).

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Technican: O.K., I'm having a slight problem understanding this.You say glass is fully operational from dash but not at gate.You bypassed power and got run up but not down.Was this bypass conducted directly to the motor or at the actuator?By wiring harness, do you mean the actual wires or the actuator itself?If the glass is operating from the dash in a correct manner, then I would have to rule the motor and regulator close to not being my objective.If your bypass was not direct to the motor, try this.If the glass operates when alternating power direct to the motor, then I would have to say the actuator is your problem.In the 14yrs I spent with a Ford dealership, this was one of the most common causes of the problem you are describing. Paul

Owner: Paul, I solved my problem. The cause was actually the tailgate window’s “Dash Mounted Switch” even though the problem seemed isolated to the Tailgate Key Switch not causing the window to down. I found a better wiring schematic (for circuit 405) on the internet than the one I had. Apparently what happens when using the Key Switch, the return electrical path to Ground flows through the wiring harness and then through the dash mounted switch (some engineer got paid way too much money to come up with this circuit). I jumped the wire return path wire to ground then the tailgate key switch worked perfectly. After the dash mounted switch, the up and down circuits to ground are combined, therefore it must be the dash switch. I ordered a new switch from the Jeff’s Bronco Graveyard, I’ll update you next week as to my success although I am 95% sure. broncozone.com/forums/index.php?act=Attach&type=post&id=1664 broncozone.com/forums/index.php?showtopic=5035&hl= Is this site secure to add a personal e-mail address?

Technican: Yes the dash and gate actuator share a common ground.You did some good research to come up with your apparent solve.Do let me know of the outcome.As far as the e-mail, thats up to you.I have a spam seperater so when I submit my address to some sites, I dont get a bunch of garbage unrelated to what I was seeking in the first place. Paul

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