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Hard to say , would need to view wiring diagrams an test the electrical circuit's for the vent windows to find the reason why . Do you know what a wiring diagram is an how to use with DVOM - digital volt ohm meter to test the circuit's ? Checking connectors , wiring , switch operation ? Pulling the driver door panel an vent window trim panel to check for B+ voltage at the motor etc.... Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine . Under system click on body & accessories , then under subsystem click prower windows. Click the search button then the blue link. The first diagram shows the vent windows circuit's . Electric Testing Techniques You Need to Know
PWR WDO - 30amp circuit breaker , DRV -MDL 10amp fuse - both are located in the rear fuse box .
Fuse Block Rear
Under the left side of the rear passenger compartment seat
Hi Raymond
Not sure about a wiring diagram but the circuits you mention are pretty straight forward. (I have a Ford 2000 Explorer.) These small circuits don't use a relay they just get fed directly from a fuse. The Signal lights also have a flasher in the circuit. Use a 12v test light to test for 12v on top of each fuse to find the open one rather than removing each.
Cheers
I don't know if this will come thru or not. You may need to get a shop manual to get all of the diagrams to troubleshoot the circuits. The diagram I found shows two tanks, and each one has a relay for the pump. The relays and gauge are controlled by the PCM and both pumps are grounded together. This may or may not match your truck.
There are two PCM 10amp fuses that power the computer. The computer provides grounds to some 20 or 30 different circuits. Any one of those circuits could blow one or both of the 10amp fuses. I would probably unplug the PCM and see if the fuses still blow. If not, you will need to pin test each circuit from the PCM to find the short. And you'll need a shop manual to get the wiring diagrams for those circuits.
you will need a wiring diagram to find problem, first make sure the power feed circuit is good, use a test light or volt meter will be better, some times cigarette lighter circuit and o.b.d.II feed share same circuit. also look at signal circuit. it should b between 5*7 volts.
Check the ground wire for the affected circuits , Looking at wiring diagrams to see if these thing's share a common ground point . Most of the time it is a ground circuit problem ,not fuse ( B+ ) supply . Do you know what an automotive electrical wiring diagram is ? Do you know what an how to preform electrical circuit voltage drop testing ? Buy a DVOM an test ! Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia Electric Testing Techniques You Need to Know
Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine size. Looking at wiring diagrams these componets share ground G201 . I would look for that , probably loose .behind the left kick panel .
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