Rear Window Defroster

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randallbrink@mac.com - 12 Nov 2007 07:59 GMT

I have been unable to determine the problem with a non-working rear
window defogger/defroster on my '79 300D. I was told here that the
most likely cause of its failure was am 80A strip fuse that I cannot
locate. The 16A fuse in the fusebox has been replaced. The light on
the degogger panel switch lights when activated.

Is it possible that the rear window itself, e.g. the elements in the
window have failed?

Any suggestions at all will be very greatly appreciated.

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Tiger - 12 Nov 2007 16:18 GMT

There is a relay for rear defroster... the 80A fuse is for glow plug system
on your car... If there is a short, the fuse would be blown.

You can check if rear window is still good by measuring the continuity.

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randallbrink@mac.com - 12 Nov 2007 18:56 GMT

> There is a relay for rear defroster... the 80A fuse is for glow plug system
> on your car... If there is a short, the fuse would be blown.
>
> You can check if rear window is still good by measuring the continuity.

Ah, so the information I was given regarding the 80A strip fuse did
not apply to the defogger.

Thanks for this information, and where is the relay located? Is it
likely then that the reply is blown, causing the total failure of the
defogger?

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