Connected the battery backwards ... - MR2 Owners Club Message Board
 
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post #1 of 14 (permalink) Old September 22nd, 2019, 14:07 Thread Starter
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Connected the battery backwards ...

I connected my battery backwards for a moment. There were some sparks for a moment before I removed it.

It starts and the exterior lights seem to work. However, the interior lights stopped working, ceiling/map lights and door panel lights (dashboard lights work).

Is this simply a blown fuse? What fuse is this?

Anything else I should look into?
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post #2 of 14 (permalink) Old September 22nd, 2019, 15:56
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Quote:
Originally Posted by diracdeltafunct View Post
I connected my battery backwards for a moment. There were some sparks for a moment before I removed it.

It starts and the exterior lights seem to work. However, the interior lights stopped working, ceiling/map lights and door panel lights (dashboard lights work).

Is this simply a blown fuse? What fuse is this?

Anything else I should look into?
It will be the 15Amp DOME fuse in the kick panel by the door.
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post #3 of 14 (permalink) Old September 22nd, 2019, 16:03 Thread Starter
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Originally Posted by GDII View Post
It will be the 15Amp DOME fuse in the kick panel by the door.
Thanks!
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post #4 of 14 (permalink) Old September 22nd, 2019, 16:42
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Don't know how you managed to do this and just blow the dome fuse.
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post #5 of 14 (permalink) Old September 22nd, 2019, 21:28
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Don't know how you managed to do this and just blow the dome fuse.
I'm puzzled as well
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post #6 of 14 (permalink) Old September 23rd, 2019, 10:10
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Doesn't the main fuse link typically fry on an accident like this?
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post #7 of 14 (permalink) Old September 24th, 2019, 11:43
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What is supposed to happen is that the alternator diodes will short circuit the battery until the fusible link blows, and that will protect the rest of the vehicle electronics. If the fusible link has been patched out, then the surge will continue until the alternator diodes pop, and then the reverse voltage will run through the rest of the harness, blowing out fuses and modules willy-nilly. The results then are unpredictable.
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post #8 of 14 (permalink) Old September 25th, 2019, 11:48 Thread Starter
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It was indeed the DOME fuse, however, it isn't in the kick panel, it is in the front trunk fuse box.

I didn't actually replace it yet, just noted that it was burnt over. Once I get a new one I'll know if that actually fixed anything.
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post #9 of 14 (permalink) Old September 25th, 2019, 11:48 Thread Starter
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Originally Posted by rmeller View Post
What is supposed to happen is that the alternator diodes will short circuit the battery until the fusible link blows, and that will protect the rest of the vehicle electronics. If the fusible link has been patched out, then the surge will continue until the alternator diodes pop, and then the reverse voltage will run through the rest of the harness, blowing out fuses and modules willy-nilly. The results then are unpredictable.
Do you think my alternator is also damaged?
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post #10 of 14 (permalink) Old September 25th, 2019, 13:18 Thread Starter
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Yeah, after replacing the DOME fuse everything seems ok. The battery is charging correctly. Nothing else seems broken.

Last edited by diracdeltafunct; September 25th, 2019 at 19:44.
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post #11 of 14 (permalink) Old September 25th, 2019, 15:37
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I had FWD Corolla on my mind, not sure why I thought it was in the kick panel.
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post #12 of 14 (permalink) Old September 25th, 2019, 19:44
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Whenever you have an electrical problem start by checking ALL the fuses.
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post #13 of 14 (permalink) Old September 25th, 2019, 19:45 Thread Starter
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I had FWD Corolla on my mind, not sure why I thought it was in the kick panel.
Still, thanks GDII.
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post #14 of 14 (permalink) Old October 1st, 2019, 04:34 Thread Starter
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Update:

Unfortunately I've discovered a new problem.

Even with the door shut, the dome lights and the circular green key light (Is this an aftermarket thing? It came with my car) remain on, but this happens sporadically.

I left my car for half a day, walked past it, the dome lights were off. Then passed it again half a day later, and the dome lights and key light were both on. Opening the door turns on the lights in the lower part of the doors, these lights were not part of the problem.

I disconnected the battery and reconnected it later, but then the problem didn't present itself.

I've checked all fuses, and I have no idea what is going on.

Is there some diode or something that perhaps got burnt? What should I look into?
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