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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.

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Old 03-03-2007, 01:26 AM   #1
Boosted5.slow
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Default alternator

alright on my 89 5.0 the alternator guage in the dash doesnt want to move.stays right abouve the red but below the middle line. i went out and strated it my head lighs are still bright no problems with anything. the other day i noticed the guage danceing a little bit. could this just be a guage or something else. i know im not really giveing you much but im at home and have no tools here not even a multimeter just looking for best guess.
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/TRICKFLOW STAGE 1 CAM/Holley systamax manifold /MSD DISTRB/SHORTYHEADERS/DUAL40SERISFLOWS/nos plate system/
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Old 03-03-2007, 01:54 AM   #2
94ford5liter
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Default RE: alternator

if the gauge is going up and down, could be a couple of things, but kind of need more details. Could be your battery cable ends are bad and need to be replaced, they also could be lose. You could also have a loose ground, or if you have underdrive pullies, that will make it go up and down as well.
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Old 03-03-2007, 01:55 AM   #3
sastangman
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Default RE: alternator

which alt do you have on the car stock or
130 amp??
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Old 03-03-2007, 02:02 AM   #4
Boosted5.slow
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Default RE: alternator

the alternator someone has replace the alternator with an autolight still looks kinda new battery cables good. no underdrive pulleys i have paxton sc
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Old 03-03-2007, 03:36 AM   #5
Li0nHart
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Default RE: alternator

diodes....do your lights fliker at night a bit when just idleing the car?
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Old 03-03-2007, 03:52 AM   #6
FivePointOhh
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Default RE: alternator

maybe voltage regulator, mine went out. but when i replace alt it still dances around still between the line just below the middle and the line just above the middle depending if its under a load it goes up or if i turn on my lights or heater it goes down a lil bit. it doesnt jump eratically but it does move promptly when i do something is this bad?
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Old 03-03-2007, 03:52 AM
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