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Another non working odometer thread(it’s not the gears) 83 380SL

1676 Views 10 Replies 5 Participants Last post by  plinker17722
I have an 83 380sl that ive been trying to figure out why I can’t get the odometer to read. This car was purchased brand new by my sisters late father in law. When he passed away approx 30+ years ago, my brother in law gained ownership. Unfortunately, my brother in law passed away a few years ago and my sister didn’t want to see it sit... So I gave it a home, the car was well maintained it’s entire life, only going to Mercedes dealerships for all its service, including quite some extensive maintenance work. It now has 88k miles on it and all of a sudden the odometer stopped working on a ride to get coffee last weekend. After hours up hours of research, it led me to pulling the cluster out and taking a look. I immediately seen broken gears, so went ahead and ordered a set. Did the repair smoothly as per a thread on here actually, but did not resolve the issue. Everything else on the cluster works, aside from the clock (which I know from reading, that’s also prone to need repair). My main concern is the odometer though. I have a multimeter to troubleshoot, but don’t know where to begin. I’d love to be able to verify it’s getting proper signal to the stepper motor or whatever magnetic system it uses to drive the odometer gears. I can spin the shaft and see that the gears are working correctly and odometer moves. Once installed back in the car, nothing. Looking to see what my options are. Any advice is greatly appreciated.
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The last paragraph states that I’ve already verified that they work correctly and operate the odometer when I manual spin by hand. The cluster has been in and out 20 times checking to see if there is anything I possibly missed.
Was hoping I’d get some suggestions here 😞
I’m going to remove it again today to check something. I seen a small rectangular fuse type piece soldered in a board on back... I noticed a hole in the center, after some finding some new pictures I think that it might be blown. I just want to figure it out, I don’t think the motor is working. I wish I knew what made it work so I could bench test. Also don’t know if it’s getting the proper signal even though the speedometer works.
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