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Author Topic: Alt Light Flickering  (Read 1250 times)

Offline ChrisV289

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Alt Light Flickering
« on: May 30, 2011, 12:28:22 PM »
Was going to take my car for a little cruise this morning before it gets to hot out here but my alt light seems to be flickering.  Not sure what the problem could be. The alt belt is tight. All the battery cables seem tight as well.  Thoughts on to what else it could be or maybe something I missed.

Thanks
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Chris
1965 Honey Gold Fastback (SJ 10/29/64)
1965 Caspian Blue Fastback (SJ 06/03/65)
2009 V6 Mustang Coupe

Offline carlite65

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Re: Alt Light Flickering
« Reply #1 on: May 30, 2011, 01:36:50 PM »
put a voltmeter across the battery terminals. tell us what the reading is. another test to isolate a bad component is to disconnect the voltage regulator WITHOUT the car running. jump the A & F terminals in the plug. start the car. now what is the reading?? if it increases then the alt is ok and the VR is bad.
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5F09C331248

Online Murf

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Re: Alt Light Flickering
« Reply #2 on: May 30, 2011, 01:52:19 PM »
Do you have a mechanical voltage regulator?  (as opposed to a solid state VR?)
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John Murphy

1965 "K" GT fastback Honey Gold exterior, Ivy Green and White Pony interior, many options
1966 Conv., high option, removeable hardtop, thermactor "C" engine, AC, Springtime Yellow exterior, Black Pony interior
1968 California Special, "J" code, ,many options, white with red interior

Offline ChrisV289

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Re: Alt Light Flickering
« Reply #3 on: May 30, 2011, 02:00:30 PM »
No...I'd have to take a trip to Checker/O'Reilly for them to test it...Not sure if they are open today...
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Chris
1965 Honey Gold Fastback (SJ 10/29/64)
1965 Caspian Blue Fastback (SJ 06/03/65)
2009 V6 Mustang Coupe

Offline ChrisV289

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Re: Alt Light Flickering
« Reply #4 on: May 30, 2011, 04:45:48 PM »
So here is something new...Turned on the headlights before I started the car and the lights dimmed for a second before it started but the alt light didn't blink.  But as soon as I turned off the headlights, the alt light started flickering again...
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Chris
1965 Honey Gold Fastback (SJ 10/29/64)
1965 Caspian Blue Fastback (SJ 06/03/65)
2009 V6 Mustang Coupe
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