Author Topic: Dash Lights part 2+  (Read 5829 times)

Jonny B

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Dash Lights part 2+
« on: October 11, 2003, 18:09:40 »
I have followed the archives to try and figure out what is happening with the dash lights on my 250SL. I replaced the bulbs, checked the fuses, reconnected the brown wire to the keeper on the back of the tach, and still nothing. The lights do illuminate the center gauges (fuel, oil and temperature) but none of the others. Any ideas on where to try next will be appreciated.

Jonny B
1967 250SL Auto
Jonny B
1967 250 SL Auto, DB 568
1970 280 SL Auto, DB 904
1966 Morris Mini Minor

Cees Klumper

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Re: Dash Lights part 2+
« Reply #1 on: October 12, 2003, 10:56:51 »
Could it be bad ground? Have you checked (jumpered) the rheostat (intensity control)? I assume you have checked the bulbs themselves. You can check them in-place by hooking up a live wire. If all this fails, if it were my car, I would probably run auxiliary wires from the functional center instrument cluster lights to (at least one of) the other lights/leads - maybe this restores power to the other ones as well.

Cees Klumper in Amsterdam
'69 white 280 SL automatic
Cees Klumper
1969 Mercedes 280 SL automatic
1968 Ford Mustang 302 V8
1961 Alfa Romeo Giulietta Sprint Coupe 1600
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ja17

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Re: Dash Lights part 2+
« Reply #2 on: October 12, 2003, 20:18:05 »
Hello Jonny,
You must also have a brown ground wire attached under the thumb screw behind the tach and the speedometer.

Joe Alexander
Blacklick, Ohio
« Last Edit: October 12, 2003, 20:19:22 by ja17 »
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
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1965 220SE Finback

Jonny B

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Re: Dash Lights part 2+
« Reply #3 on: October 13, 2003, 05:27:23 »
I may be missing the ground at the speedo. I did not pull the center cluster and speedo out. I do have the brown ground wire attached at the tach. When I pulled the tach, I found that I was missing the seal pad. I am going to order one of those, and when I get it, go back into the dash and check the ground. If these are all okay, I will probably go for a rewire as Cees suggested.

Jonny B
1967 250SL Auto
Jonny B
1967 250 SL Auto, DB 568
1970 280 SL Auto, DB 904
1966 Morris Mini Minor

J. Huber

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Re: Dash Lights part 2+
« Reply #4 on: October 13, 2003, 10:04:45 »
This is a longshot but when you tested Tach light, did you have bulb housing all the way into Tach? I recall that if you test lights before this point, they don't function. They need to be "seated" all the way in to get power. Also be sure the wires on back of bulb housing are attached... mine came loose my first time around.

Good Luck

James
63 230SL
James
63 230SL

Jonny B

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Re: Dash Lights part 2+
« Reply #5 on: October 13, 2003, 10:25:39 »
Yes, I had the bulb holders all the way into the tach sockets. I broke the wire when I removed the holder, so I had to re-attach it, so I knew those were alright too.

Perserverance.


Jonny B
1967 250SL Auto
Jonny B
1967 250 SL Auto, DB 568
1970 280 SL Auto, DB 904
1966 Morris Mini Minor

Mike

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Re: Dash Lights part 2+
« Reply #6 on: October 15, 2003, 16:21:00 »
quote:
Originally posted by Jonny B

I have followed the archives to try and figure out what is happening with the dash lights on my 250SL. I replaced the bulbs, checked the fuses, reconnected the brown wire to the keeper on the back of the tach, and still nothing. The lights do illuminate the center gauges (fuel, oil and temperature) but none of the others. Any ideas on where to try next will be appreciated.

Jonny B
1967 250SL Auto



Michael L. Hund

Mike

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Re: Dash Lights part 2+
« Reply #7 on: October 15, 2003, 16:24:30 »
quote:
Originally posted by Mike

quote:
Originally posted by Jonny B

I have followed the archives to try and figure out what is happening with the dash lights on my 250SL. I replaced the bulbs, checked the fuses, reconnected the brown wire to the keeper on the back of the tach, and still nothing. The lights do illuminate the center gauges (fuel, oil and temperature) but none of the others. Any ideas on where to try next will be appreciated.

Jonny B
1967 250SL Auto



Michael L. Hund

I hate to distract this discussion but I have a similar, related problem.  All of my dash lights work but they are very dim.  If I adjust the rheostat they turn off completely.   The rheostat is set at the highest setting but any adjustment causes the lights to go off completely.  Any ideas about the cause of the problem?


Michael L. Hund

Jonny B

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Re: Dash Lights part 2+
« Reply #8 on: October 16, 2003, 05:22:44 »
Use the search feature with 'dash lights' and you will run across a several strings that speak to this problem, which appears to be fairly common. There are a number of fixes documented.

Jonny B
1967 250SL Auto
Jonny B
1967 250 SL Auto, DB 568
1970 280 SL Auto, DB 904
1966 Morris Mini Minor