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  #1  
Old 02-20-2003, 02:45 AM
Dave Bunker's Avatar
tvbunk
 
Join Date: Aug 2002
Location: Elk Grove, CA. 95758
Posts: 90
rear defroster

My 87 420 rear window defroster is not working. Does anyone know if there is a heating element the heats the wires up somewhere on the car that can be replaced? I like all things to work on the car and that is the only thng not working at the present.
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Dave Bunker
1987 420SEL, 180k strong Blu & Grey
2004 Road King Custom
Sacramento, CA
tvbunk@comcast.net
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Old 02-20-2003, 07:27 AM
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Join Date: Jan 2003
Location: Epsom Downs, England
Posts: 152
Dave,

You've got to start somewhere: check you have 12V at one end of the window element, and a good chassis connection at the other.

If you don't, work logically back from there to the switch, fuse and eventualy the battery.

Somewhere along the journey the 12V will reappear; then you should know where the fault lies.

Also check that the element hasn't gone high-resistance. By my guestimations, the element should measure less than 1 ohm (ie. Not a short circuit, but close).

Even if you have to splash-out on a DVM, it'll still be MUCH cheaper to prod around yourself and employ a bit of thought rather than auto electrician.
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  #3  
Old 02-20-2003, 11:50 AM
Dave Bunker's Avatar
tvbunk
 
Join Date: Aug 2002
Location: Elk Grove, CA. 95758
Posts: 90
Thanks Paul

The old "trace it backward plan". Done it many times. Maybe it won't be too hard to find.

Thanks for your reply....I'll let you know what I find FYI.....

Dave
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1987 420SEL, 180k strong Blu & Grey
2004 Road King Custom
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tvbunk@comcast.net
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