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'83 240D Auto 67k; '83 240D Manual 97k; '83 240D Manual 198k; '83 240D Manual 340k; '81 300D; S420
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Discussion Starter #1
I have a few "EXCUSES" of why I made the mistake but in the end it all comes down to operator error. Last night I put in an optima battery which has the terminals opposite of the battery I took out. Yep...... you guessed it. I fried the alternator at the very least.

I replaced the alternator and checked the fuse box today but I am still having serious issues. When I turn the key on - the battery, brake, and parking brake (even when released it only dims a little) lights stay on. The glow plug light comes on and goes off as normal. When I turn the key to the start position, I hear a faint click from what sounds like the left side of the engine bay but the starter doesn't engage. I even tried the hot wire trick with a wire on the solenoid posts which I have used in the past when the ignition switch went bad.

Does anyone have any advice on how to fix what I'm guessing could be a serious problem/problems????? Would this fry the starter or solenoid too? Anything else I should check? Any guesses as to why the battery light is still on?

Any help would be greatly appreciated!!!

Yes, I know. I'm an idiot.........:surrender:
 

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85 Audi Coupe Quattro, 85 Audi Coupe GT, 71 BMW turbo 2002, 73 BMW 2002tii, 85 BMW 635csi
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Safety neutral switch may have been damaged. Try starting in neutral :dunno:
 

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'83 240D Auto 67k; '83 240D Manual 97k; '83 240D Manual 198k; '83 240D Manual 340k; '81 300D; S420
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Discussion Starter #3
its a manual.......
 

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'83 240D Auto 67k; '83 240D Manual 97k; '83 240D Manual 198k; '83 240D Manual 340k; '81 300D; S420
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Discussion Starter #5
What is a fusible link?
 

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What is a fusible link?
IIRC, it's like an inline fuse. See this link for a good picture.

Fusible link : BMW E34 Website

Did you try to start the car with the battery hooked up backwards? If so, you could have theoretically fried just about anything. If you didn't turn the key, that narrows the possibilities I think because some things don't have power unless the key is in a certain position. You'll have to check every system that engages in the key position in which you had the car, or in which you placed the car, while the battery was hooked up wrong. Luckily, there aren't any computers to worry about... :D

Did anything melt while the battery was in wrong, or was there any smoking? Those Optima batteries probably put out lots of amps.
 

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1984 300D
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I have never read of reversing the polarity damaging a Starter.

Is I possible that the Battery itself was damaged or the Battery Cables were damaged?

Try swapping a Battery from another Car (with the Alternator connector un plugged) and see if you can at least get the Starter Solenoid and Starter to work.

If misery loves company years back I managed to knock a Screwdriver into the Timing Belt of my idleing Volvo Diesel breaking the Belt.
The effect was that some Valves hit pistons.
The only solace is that no one is mistake proof.
 

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Here's another one to make you feel better: I did this with a 24V series set up on an M35A2. How? The connection was just a tad loose. It would have been fine on a normal car battery. But here the amps were so great it instantly melted the terminal post. :eek: And at 9PM, 600 miles from home at a truck stop and having previously bought the only two batteries this size in town... Got moving about 4.5 hours later with 2 Walmart batteries. Luckily it wasn't cold out. :)

2010-11-19 21.29.31.jpg
 

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ok.... are these cars too old to have a main fuse?? I did this once on a much newer car and all I had to do was replace the main fuse.
 

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'83 240D Auto 67k; '83 240D Manual 97k; '83 240D Manual 198k; '83 240D Manual 340k; '81 300D; S420
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Discussion Starter #11
Steering Lock Electrical Connector Removal?

Finally got it started again. New alternator and starter and now I'm finally getting back to working on the original issue I had. I replaced the ignition and steering lock and things seem to be going well until I was unable to get this small black plastic electrical connection off. I've tried moving the key to various positions and sliding in small tools trying to "unlock" it. Does anyone know how to remove this?

The first picture is of the old steering lock with the plastic connector still stuck on. The next 2 are of the new steering lock without the plastic connector showing where it goes in.

Thanks for any help.
 

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'83 240D Auto 67k; '83 240D Manual 97k; '83 240D Manual 198k; '83 240D Manual 340k; '81 300D; S420
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216 Posts
Discussion Starter #13
Is that only for the seat belts? If so, I probably won't mess with it anymore. If it's tied into the buzzer for when you leave the head lights on or something else it's probably worth the effort. Does anyone know if it's tied into any functions other than just the seat belt?


Thank you.
 

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W108 250s '67, w123 280ce '77, w123 300d-t '85, w126 300sd '85', w140 s600 '94,w210 e230 '97, bug69
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Its only for the sawt belt buzzer, i left that black thing when i changed my ignition switch, and just removed the seat belt sensor connected to my seat belt lock, i did this on my 300sd
 
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