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89gt All good until I turn the Key?

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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

89gt All good until I turn the Key?

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Old 06-12-2011, 10:03 AM
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wgreenlee4
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Question 89gt All good until I turn the Key?

I recently acquired an 89gt coupe that has been sitting in a garage for a few years and when I jumped it, all the lights were coming on nice, but when I turn the key all the way (to start) in all goes black. You then have to disconnect the battery and let it sit, doing so will make it repeat the cycle. Does anyone know why?
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Old 06-12-2011, 11:36 AM
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AdderMk2
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put a new battery in the car before you melt something
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Old 06-12-2011, 12:23 PM
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Originally Posted by wgreenlee4 View Post
I recently acquired an 89gt coupe that has been sitting in a garage for a few years and when I jumped it, all the lights were coming on nice, but when I turn the key all the way (to start) in all goes black. You then have to disconnect the battery and let it sit, doing so will make it repeat the cycle. Does anyone know why?
Most likely something is breaking connection. Check all the connections at the battery, starter and solenoid.
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Old 06-12-2011, 09:09 PM
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mjr46
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if the battery is good, check all connections, you have a bad connection / corrosion in a connection somewhere
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Old 06-12-2011, 10:33 PM
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wgreenlee4
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Well, I tossed my ford focus battery in there and it started up nice, we couldn't figure out what was with that battery but whatever I'll get a new one, thanks for the help.
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Old 06-12-2011, 10:40 PM
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mjr46
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it's called, the battery is bad^^^^^^^^^^^ if it frooze due to it being in a state of discharge since it was not bing used , it most likely has shorted cells in it
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Old 06-12-2011, 10:50 PM
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Well, the thing that was weird about it was that it would hold a charge, the cars lights and stuff worked, but the electrics would reject it when I tried to start it. But w/e you're right still, it was bad.
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Old 06-12-2011, 11:42 PM
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they will still show they have voltage even with a bad cell
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Old 06-13-2011, 07:51 AM
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Originally Posted by wgreenlee4 View Post
Well, the thing that was weird about it was that it would hold a charge, the cars lights and stuff worked, but the electrics would reject it when I tried to start it. But w/e you're right still, it was bad.
unless you performed a load test and or checked the specific gravity of each individual cell you cannot state such.......there is more to testing batteries then just voltage being present so I doubt you performed or have the proper equipment to test batteries to draw a proper conclusion to what was bad about the battery.
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