80 300 td wagon Turn signals suddenly died - Page 2 - PeachParts Mercedes-Benz Forum

dieselbenz1 · #16 09-28-2014, 08:24 PM

I recall this happend to my 80 wagon about 10 yrs ago. I checked the fuse several times before finding the hairline crack. Also clean the fuse holder contacts. I believe the 4 ways worked just not the turn signals but I am uncertain due to memory.

jay_bob · #17 09-28-2014, 08:34 PM

Good point, there are 2 feeds on different fuses to the relay.

One is switched for the turn signals, and the other unswitched for the 4-ways.

Be sure both (really you ought to check that all) fuses are good. Remove them and inspect them. I had one that had a micro crack right at the bend. Looked great but as soon as I pulled it the strip fell apart in my hand.

If you find any corrosion on the fuse tabs, do not abrade them with anything. This will destroy the plating and make the situation worse. Use some Tarn-X or silver polish on a q-tip.

ytmtnman · #18 09-28-2014, 09:01 PM

So what's up with your blinkers? Are they functional again? I am pulling for the repeated on/off of the flashers to clear up the "congestion".

dieselbenz1 · #19 09-28-2014, 10:11 PM

A common pencil eraser is great for cleaning electrical contacts non abrasive and leaves them with a a nice shine . Sand paper is the worst gouges the contacts may work but will not last as long and degrades the contacts.

leviegray · #20 10-21-2014, 04:01 AM

Quote:

Originally Posted by whunter

However, living in Michigan SALT, it is common for the ground wire by each light assembly to corrode/break.
Bulb and wire terminal corrosion has forced me to replace a huge number of sockets or wire pins to restore function.

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NEVER cut/splice into the horn, wiper, exterior lighting or turn signal relay ground for after market accessories = this is a safety issue.

Then there are after market accessory installers who cut/splice into any handy ground, ignoring manufacturer directions that require a dedicated ground wire to the body metal - battery..

This often causes later issues:

#1. Sudden loss of function.

#2. Erratic - Random function.

#3. Fast/slow or weak pulse flasher.

#4. Circuit ground back feed.

#5. Melted wire or in rare worst case scenarios, a FIRE due to over load.

#6. Headache and cursing.

.

Any idea where the flasher switch grounds on the 80 300 td wagon? I have checked all of the body grounds that I could find but it seems like it that were the problem, all of the lights wouldn't work when I hotwire 12v current to one of the wires connected to the flasher switch ( they all work- and at the command of the turn signal switch on the steering column.

I guess your post is a vote against my next idea was to wire a flasher relay directly into this new circuit that I temporarily created - as a work-around to the problem. I am getting desperate....