garage find - Mercedes-Benz Forum

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post #1 of 15 (permalink) Old 01-23-2014, 11:21 PM Thread Starter
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Date registered: Jan 2014
Vehicle: 1975 280s
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garage find

I recently bought a 1975 280s that has always been garaged. Unrestored in near mint condition. It did need a front end alignment and new tires. I have rediscovered the pleasure of driving! I need help with an electrical issue with the power windows. They only work periodically and I have checked the fuses and all 4 switches. All ok. It's probably a bad connection or maybe a master relay. Any ideas?
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post #2 of 15 (permalink) Old 01-24-2014, 04:31 AM
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I'm betting corroded contacts in the switches. I'm not familiar with the design of the older models but you may can take the switches apart and clean the contacts with sandpaper.

Beautiful car. How many miles on it?

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post #3 of 15 (permalink) Old 01-24-2014, 09:39 AM
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Also check to see if all the fuses are orgional if they are change them out with no fuses. Older fuses can have corrosion that can cause this problem


Nice find load up more photos
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post #4 of 15 (permalink) Old 01-24-2014, 10:50 AM
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Remove and replace all the fuses with copper/brass cermaic ones....they may look good but can have bad ends...



As was said the switches probably also need cleaning...

I would also plan on removing the regulators from the doors and cleaning them...
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post #5 of 15 (permalink) Old 01-24-2014, 11:42 AM Thread Starter
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more of the 75' 280s

Thanks for all the quick response to the power window problem. I guess I didn't realize that all four switches could go bad at the same time but I guess a car this old that anything is possible. I will replace the fuses too. Here's a couple more pic.
Thanks again guys
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post #6 of 15 (permalink) Old 01-24-2014, 12:17 PM
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Sweet ride! I would start with the fuses. Also, it is easy to prey up the window switches and check for current in and out of the switches. Happy motoring!

: )
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post #7 of 15 (permalink) Old 01-24-2014, 02:04 PM
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To further trouble shoot, does it only affect the switches in the console or is it the rear door switches that don't work consistently too? If the console switches do not work and the rear ones do, it is likely the switches in the console. If no switches work, it is likely the fuses. If the console works but not the rear, it is likely the child lock switch in the console.

As said above, the switches are easy to remove, take apart, clean and put back together.
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post #8 of 15 (permalink) Old 01-24-2014, 08:07 PM
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I vote for the switches. In the center console.

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #9 of 15 (permalink) Old 01-24-2014, 08:20 PM Thread Starter
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Scoot,
The more I read the more your suggestion is right.
Thanks
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post #10 of 15 (permalink) Old 01-24-2014, 08:41 PM
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You can get them from autohausaz.com fairly affordably compared to buying them from MB.

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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