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Old 08-30-2008, 10:41 PM   #1
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Car Stalling after disconnecting battery

I have an 87 Mustang GT, just purchased a few weeks ago. It had a big autometer tachometer I was not a fan of so I decided to take it out. I disconected the battery and due to the way it was wired I had to take the gauge cluster out. While I had it apart I decied to clean it up a bit so I took off the plastic cover of the intrument panel and cleaned all of the gauge cluster which was a mess, in the process I did hit the oil pressue needle by accident, but it dropped back down to where it was before I hit it. I took out the wiring for the autometer tachometer, and re-connected the stock wiring where it was spliced for the autometer tachometer (one wire was spliced into a crane cam ignition coil).

I put everything back together and took it out for a drive. Drove for about 10 min and everything was fine. On my way back home coming to a stop, the oil pressure gauge drops down to almost 0, the amp light comes on, the low coolant light comes on, and check engine light comes on, then the car stalls. Start it back up and the oil pressure is reading very low. Same thing happens coming to the next stop sign except I kept it from stalling. Get it back home in the garage and shut it down. I check things out, disconnectd the oil pressure sending unit and connect it again and start the car up again. The idle is all over the place, surging up and down almost stalling each time. The oil pressure reads in the middle but also drops up and down with the idle.

I know the car has to 're-learn' after the battery is disconected but I had disconnected it before to install a stereo and had no issues after starting it up again. What are your toughts on the oild pressure, is it just to gauge or could I have an oil pressure issue? Is there anything else that would need to be done to re-set the idle after disconecting the battery? I do have underdrive pullies. My biggest fear is the oil pressure, any easy way to accurately check this? The engine was just rebuilt 5000km ago.
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Old 03-31-2009, 05:41 PM   #2
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Re: Car Stalling after disconnecting battery

I would check my altanator first.
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Old 04-01-2009, 09:40 AM   #3
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Re: Car Stalling after disconnecting battery

trip to the local autozone/napa store to test alternator. If you would like to try a home test (not always accurate) unplug the positive cable while vehicle is running, if the vehicle dies you have a charging issue with the alternator (let it sit a few mins)
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Old 04-01-2009, 12:10 PM   #4
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Re: Car Stalling after disconnecting battery

Or if you have a multimeter you can test the positive lead out of the alternator and see the voltage it is giving. Then test across your battery. The alternator should be higher (by a few tenths of a volt - 1 volt) then the battery. There should be a way to do current to, very similar. Current from the alternator again should be higher then from the battery.
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Old 01-14-2011, 01:06 AM   #5
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Re: Car Stalling after disconnecting battery

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Originally Posted by SaleenFiend View Post
trip to the local autozone/napa store to test alternator. If you would like to try a home test (not always accurate) unplug the positive cable while vehicle is running, if the vehicle dies you have a charging issue with the alternator (let it sit a few mins)
OMG terrible idea!!!! WAY too hard on the alt! and had on pretty much everything! Can ruin computers if bad enough!
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Old 01-17-2011, 08:46 AM   #6
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OMG terrible idea!!!! WAY too hard on the alt! and had on pretty much everything! Can ruin computers if bad enough!
This will not harm anything that isn't already damaged or operating incorrectly due to low voltage from the alternator. If the alternator is performing correctly then there will be no issue. It's not like this is happening over a constant extended period of time. What do you think happens when your putting a load on the alternator with a tester? You putting stress on the entire system.
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Old 01-17-2011, 02:24 PM   #7
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Re: Car Stalling after disconnecting battery

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This will not harm anything that isn't already damaged or operating incorrectly due to low voltage from the alternator. If the alternator is performing correctly then there will be no issue. It's not like this is happening over a constant extended period of time. What do you think happens when your putting a load on the alternator with a tester? You putting stress on the entire system.
If you disconnect the battery the alt will see that the battery isnt charging then will put out a LOT of volts and or amps I cant remember right now (but it will come to me! lol) and that can be too much for some of the solid state componets like pcm, bcm etc
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Old 01-17-2011, 03:01 PM   #8
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Re: Car Stalling after disconnecting battery

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Originally Posted by SaleenFiend View Post
trip to the local autozone/napa store to test alternator. If you would like to try a home test (not always accurate) unplug the positive cable while vehicle is running, if the vehicle dies you have a charging issue with the alternator (let it sit a few mins)
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If you disconnect the battery the alt will see that the battery isnt charging then will put out a LOT of volts and or amps I cant remember right now (but it will come to me! lol) and that can be too much for some of the solid state componets like pcm, bcm etc
I agree with you both. There is a 50/50 chance you could do harm to the ecm. But my advice is check your connections at the instrument panel again because if the voltage gauge or "dummy" light inside isn't making contact it will not charge.
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