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Author Topic: Dash lights problem  (Read 6573 times)

franjo_66

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Dash lights problem
« on: November 11, 2007, 16:59:46 »
Hi folks,

My interior dash light dimmer works fine, but whenever I adjust the light brightness to full, I keep blowing the fuse ? Has anybody experienced a similar problem ? Any insight or information is much appreciated.

Rgds
Franjo
1966 230SL, Black, auto
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Franjo

1965 230SL Black/Auto/RHD
2005 Porsche Cayenne Turbo
1983 BMW 735i
1986 560 SEC
1991 500SL
1982 Holden Statesman DeVille

ja17

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Re: Dash lights problem
« Reply #1 on: November 11, 2007, 20:02:02 »
Hello franjo 66,

Sounds like the coil on the rheostat is out of position or damaged.

Joe Alexander
Blacklick, Ohio
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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

jeffc280sl

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Re: Dash lights problem
« Reply #2 on: November 11, 2007, 20:17:47 »
Here is a pic of the coil Joe is speaking about.  You need to remove the tach and center cluster gauge and then take the dimmer control off to perform any maintenance.

Download Attachment: Dimmer.JPG
51.73 KB

Jeff C.
1970 280SL 4-speed
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ja17

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Re: Dash lights problem
« Reply #3 on: November 11, 2007, 20:25:28 »
Good Pic Jeff!   Sometimes the cement that holds the coil in place lets go and the coil moves out of its bed. I have been able to fix these by setting them back with epoxy.

Use electrical contact cleaner and lube to clean the tarnish and corrosion off the coil.

Joe Alexander
Blacklick, Ohio
« Last Edit: November 11, 2007, 20:26:50 by ja17 »
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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

franjo_66

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  • Australia, NSW, Point Piper
  • Posts: 458
Re: Dash lights problem
« Reply #4 on: November 11, 2007, 22:50:34 »
Hi Jeff & Joe

Thanks for the pic & feedback. Will give it a try & see what happens !

Thanks & rgds
Frank
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Franjo

1965 230SL Black/Auto/RHD
2005 Porsche Cayenne Turbo
1983 BMW 735i
1986 560 SEC
1991 500SL
1982 Holden Statesman DeVille

graphic66

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Re: Dash lights problem
« Reply #5 on: January 04, 2008, 12:08:35 »
I also put silicone dielectric compound on the contact and spring. It rarely gets moved and this helps to keep electrolysis from corroding the spring. Also every now and then move it to keep it clean. I have glued the cracked ceramic with permatex high temp red silicone gasket material with great success.
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Bob G ✝︎

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Re: Dash lights problem
« Reply #6 on: January 12, 2008, 17:43:00 »
There is a seller on Ebay who has the resostates for sale. I called him and asked if he checked to make sure they work. I have not got a reply back which must mean approach at your own risk!!

Bob Geco
« Last Edit: January 12, 2008, 17:44:05 by Bob G »
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