Well, what to do, what to do! What is the FSM? The fuse box cover in this car says nothing about Anti Lock Brake System or Anti Theft Alarm System. There is some what appears to be some aftermarket alarm system stuff under there. I wonder if this might be an issue? I wonder if a guy could disconnect all that stuff? Am I at the spot where I have to take it to someone? I'd rather not of course!!

The FSM = factory service manual.

Its free from Mercedes now:
Untitled Document

They didnt put ABS on until 1985 so you wouldnt have that, I dont think you'd have the alarm either. But if someone added something, I would suspect that immediately. You should disconnect the power line going the after market stuff, perhaps that is the problem.

Disconnecting the brake lights only alleviated 3.5 amps from the circuit. When you hit the brakes adding 3.5 amps put it over the 8amp fuse's limit.

So something else is on that circuit drawing more than the factory intended.

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

Good News!! I went under the dash armed with a pair of wire cutters and carefully removed all the aftermarket alarm stuff. I wasn't completely sure but you can tell the original work looks alot different than this cobbed up stuff! So I got rid of it, hooked up the taillights, combination switch and took it around the neighborhood. Could not get the fuse to blow so I thought if anything will make it blow (Murphy's Law) going out it traffic will! Voila! NO blown fuse!! Woo Hoo!!! True test will be tomorrow morning but I'm optimistic. So JamesDean, thank you very much for your help!! Also, thanks for the FSM link. This will come in handy. Thank you oldsinner111 for your useful input also!

Always glad to help. Glad it worked out for you. Let us know how tomorrow morning goes as well!

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

So, yesterday after thinking we had solved the problem I drove around a lot. I drove to pick up my daughter from school and everything is fine. When I get home I put the under dash back together, I put the trunk back together and I revel in the accomplishment! Few hours later I take the car out completely confident and within a few brakings the fuse blew! I felt like crying! What a surprise and I can't believe it! I put in another fuse and it continued to work just fine for probably 15 miles of stop and go.

Just went out and within 3 brakings the fuse blew again. Not sure where to go from here. Any suggestions?