[96broncoman]

well, i know i have been askin alot of questions about the electric circuits on my bronco, and now i have a new one. i was gettin ready to apply some defrost repairing stuff by permatex to my rear defrost grid ( a few lines dont work) and just before i started i notice that the entire grid is out now. the little light on the dash doesnt illuminate and i checked the fuses. what do you guys think it may be??

 

[jam0o0]

mine does the same thing. no light no fuction. i've got a multimeter. just got to get the retated special battery for it. dam you radio shack. i've heard the wire comes loose from the glass were it attatches on each side.

 

[96broncoman]

I checked those, (visually). if i tried to go the volt meter route, what should i check first??

 

[81Bronk36]

make sure there is power to the fuze, then the switch, then the wire that hooks to the window. you should have found your problem by then.

 

[miesk5]

x

 

[96broncoman]

ok, i checked fuse m in the engine compartment, and it was blown. does anyone have any idea what may have caused this??

 

[96broncoman]

ok, so i went out and i looked for a short, im not sure exactly how, but i just checked for continuity:brownbag . afterwards, i put in a new fuse and turned the defrost on. it worked and i left it on for about 5 seconds, i turned if off and waited 3 seconds and turned it back on and it worked. i turned around to throw a frisbee for my dog and when i looked back, the light was off. i was curious how it would work for a minute and then blow the fuse, so i put in a new fuse and it blew instantly. any ideas??

 

[96broncoman]

ok, i think i get the short cut to ground causing too much current. that is easy enough, but i'm not sure which wire it is i need to replace. the fuse in the engine compartment is the one that keeps blowing, and i looked in the haynes manual and im not sure i know which wire is the one that needs replacing. thanks.

 

[96broncoman]

ok thanks, i was just confused because ive never dealt with engine compartment fuses blowing, although its just like other fuses, i thought it may help diagnose it differently. I will go try that out now, thanks for your help.

 

[96broncoman]

UPDATE

a while back, i had to diagnose a problem in my rear window wiring, and it was in the wire where it runs by the gas tank. i decided to replace the defrost wire over the same spot and it worked. i think that the previous owner may have hit cut the wires when he installed the hitch, and when i took it off, i may have disturbed them. no biggie, i finally went out there and fixed it..ya know, now that its summer and i need the defrost every morning.:thumbup