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Author
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Topic: 1991 Mustang dimming headlights/tailights and cluster.
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ed650
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Member # 9897
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posted
 
 
When I turn on the headlights everything dims and the voltage goes up and down and I dont have a sound system in it.. I just but the car 3 weeks ago and it was already converted to a 3g alternator. Any input on where to start off?
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410w Hatch
306Ci Coupe
Posts: 1744 | From: menlo park | Registered: Apr 2010
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Wht86drop
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Member # 12104
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posted
Whouldnt the pulley size make a difference?
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Jalapeña Red 86 GT Vert
Yellow 72 Chevelle
Rio Red 97 Cobra
High-Output Generations CC
Posts: 1669 | From: East Palo Alto, Fiji Islands | Registered: Jun 2012
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fordfiveoh
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Member # 13107
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posted
I would start by checking the voltage of the battery while the car is off and checking the voltage at the battery while the car is running. It takes like 12.2v to start your car and a 3G alternator should be charging your batt upwards of 14.4v. I'm just assuming it's a bad alternator or ground.
Posts: 180 | From: Vallejo, CA | Registered: Aug 2013
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84SVOrick
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Member # 9039
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posted
if the internal regulator is bad it will make the voltage go up and down and also over charge your battery, had it happen on my 86 b4, also could be as simple as a bad battery. have the battery system load checked and charging system load checked.
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Bay Area Stunnaz
RIP Jeannera "FOXY302"
10/29/87-10/9/10
1984 SVO 302 HCI a basic bitch
1986 GT FOXY302 stolen and totaled R.I.P.
Posts: 1928 | From: Vallejo CA | Registered: Mar 2009
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