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Old 04-26-2010, 06:40 PM   #1
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Default Engine wont start after battery imploded

Well I thought I could do this one on my own, like the last 3-4 problems Ive ran into. But this is proving to be a challenge to me.

Basically what happened was I used a 01 alternator in my 97 body. Was going down the road, car had been running fine for 3 days but it smelt like burning sulfur. Suddenly the windshield wipers came on, obscenely fast, the speakers start having a lot of feedback, then BOOM, speakers crack, smoke comes out from under the dash and the engine stops. I stop, pop the trunk and find my battery like this:

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Sooo..... the battery held up until 30 volts. Now Im trying to track down these problems of why my car wont start.

Got a new battery.
Check all fuses and replaced bad ones.
MS sends and receives data so its fine.
Cleaned the grounds

The car cranks over, so the battery is working, its just not firing :(. Could it of fried my coils? The engine was running fine while it started overcharging but I guess it could of shorted them out, even though they were brand new :(.

Any help is appreciated!
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Old 04-26-2010, 06:47 PM   #2
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probably fired your coils
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Old 04-26-2010, 06:54 PM   #3
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Quote:
Originally Posted by UrbanSoot View Post
probably fired your coils
****..... I keep telling myself this isn't it because I just bought those.


Who else thinks its my coils? I got a friend helping me tomorrow to check for spark.
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Old 04-26-2010, 08:13 PM   #4
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i wouldent doubt it if they were getting 30v. should check the injectors too.
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Old 04-26-2010, 08:15 PM   #5
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If I were you , I would also pop the megasquirt out and inspect the board for any damage. Just because it will communicate doesn't necessarily mean that nothing was damaged. Things of note: Check the regulator and all capacitors. If it smells like fishes, you popped a capacitor.
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Old 04-26-2010, 10:38 PM   #6
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Do you have anything regulating the voltage from the alternator?
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Old 04-26-2010, 11:12 PM   #7
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Looks like bad voltage regulator to me. The sulfur smell is typical of an over charging battery. The big question will be what electronics got fried in the process. Good luck
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Old 04-26-2010, 11:33 PM   #8
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That sucks, i dont know if i have extra coils at the house back home. I will holler at my brother and check. If they are there, i will have him bring them to an event. Remember, COPs are an option too
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Old 04-26-2010, 11:55 PM   #9
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The later alternators are regulated by the ecu. So unless you use the 01+ ecu or some external circuit the alternator wasn't being regulated at all. Hence the 30V. I don't know if there is a circuit for the MS that does this.
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Old 04-27-2010, 10:10 AM   #10
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I swapped back to the 97 alternator.

Isnt the MS fused so it doesnt fry in a case like this?

Ill try to pin point the problem today
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Old 04-27-2010, 10:49 AM   #11
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Quote:
Originally Posted by flier129 View Post
Isnt the MS fused so it doesnt fry in a case like this?
Fuses blow with current (amps) not voltage.
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Old 04-27-2010, 10:53 AM   #12
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Main engine relay?
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