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Old 10-05-2012, 02:23 PM
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Join Date: Dec 2006
Location: San Antonio, Texas
Posts: 1
1984 W123 Short Circuit in high beam indicator/instrument cluster

This is my first post/question. Before I start, I want to sincerely say thank you for such a fantastic forum and to everyone for posting such great how-to posts and for answering all the questions. I have lurked way too long without saying THANK YOU VERY MUCH! Your posts and photos have been in the garage with me more times than I can count since finding my 300TD in 2006.

Here goes my question: I have a 1984 300TD with a short in the instrument cluster. I recently had my stuck odometer repaired (I pulled and installed it myself, but I had the shop replace the broken gear) and after 50 miles and needing my high beams for the first time, I blew the left high beam fuse which also controls the circuit for the high beam indicator in the instrument cluster. It is fuse #9. I have tested the various wiring and controls related to the high beams and the only way I can get the left high beam to work without blowing the fuse is by unplugging the wiring harness from the back of the instrument cluster. The high beam indicator bulbed looked good and ohmed out like all the other bulbs. Before I dive into the cluster or take it back to the repair shop, has anyone else ran into this type of short? If not, does anyone have any suggestions on where specifically to look inside the cluster wiring for the short? I did search this topic, but I could not find anything. I hope I did not miss a prior post.

Thanks in advance,

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