muddinlate86
New member
alright so when im at a stop, my gage reads 12volts but when i go its 14.sign of a alt.going bad?
altenater
- Thread starter muddinlate86
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Shadow_D
Active member
My first thought would be a bad voltage regulator. I might be wrong but it should be on your pass fender well. Unless it is an internal VR then you would need a new Alternator.
BLADE262US
Active member
Your reply sounds right to me ShadowD . Be a good time to go to a higher amperage unit from like a lincoln Mark IIV or so 
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Broncobill78
New member
Do you have a meter available & can you tell us what the reading is across the battery terminals when the *engine is running* and at idle ? Might be the regulator, the alternator itself or even something as foolish as a loose belt. Knowing what sort of voltage the battery is actually seeing will help.
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OP
OP
muddinlate86
New member
thats with a gage.my volt meter in the truck,and on the terminals. i dont get it the alt.test fine at advance auto but when the gage drops my idel drops too and if i turn on the a.c or turn ,or heat,any thing!it will die or almost die.***
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Seabronc
New member
Does this happen when you are setting in Neutral or Park? If so, at what RPM does it start putting out a normal 13.5 Volts? It is most likely one of the three things previously mentioned. Most alternators start putting out at around 1000 alternator RPM, (the pulley ratio is around 2.5 to 1). It is possible that if your in gear idle is low and/or your alternator/regulator is weak you might not be putting out at all and what you read is the battery voltage.
Good luck,
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Good luck,
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