Author Topic: w11 other cars  (Read 2137 times)

jim 56

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w11 other cars
« on: September 29, 2021, 19:46:14 »
Still having problems with my rear defroster on my 1972 W108 sedan.Following advice from here which I asked for a couple of weeks ago I cleaned fuse holders in the engine compartment.I found the fuse for the defroster.Fuse was bliown.Put a new fuse in and it immediately blew.So I figured it was a dead short.I cannot find it anywhere.I traced the wires as good as I could.Checked theswitch to see if it was grounding out it was not.The only thing I can think of is that there is a relay in the circut.Does anybody know if there is.And if there is a possible location.
Thanks Jim

ja17

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Re: w11 other cars
« Reply #1 on: October 04, 2021, 05:56:06 »
Seems like the relay may be built into the switch itself on these cars. I would think the switch is suspect.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

jim 56

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Re: w11 other cars
« Reply #2 on: October 04, 2021, 21:05:03 »
I thought so also but I took the switch apart and checked everything. Nothing in the switch is shorting to ground but when I reinstall the switch it just blows the fuse. I actually thought that maybe it was overloading but I installed a 30 amp fuse and it still blew. Right now I have the switch bypassed and it works. That is why I think there has to be a relay because when the switch is in power must go thru the switch then somewhere else which shorts it out. I guess I just have to really have to trace the wiring all the way which could take forever since it is under the dash.
« Last Edit: October 05, 2021, 14:49:53 by Peter van Es »