Alternator light on.
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Freshman User
Joined: Nov 2012
Posts: 46
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Alternator light on.
i have a 1979 F-150 - 3wire Alternator. 85amp.
im trying to find out what would cause the dash light to stay on when its running.
also when i bought the truck the "Black/purple" while was runing to the positive side of the Solenoid
and the White wires and the Orangeish yellow wire was going to the voltage regulator.
its making my head hurt following wires. but if anyone has any feed back id love to have it!!
im trying to find out what would cause the dash light to stay on when its running.
also when i bought the truck the "Black/purple" while was runing to the positive side of the Solenoid
and the White wires and the Orangeish yellow wire was going to the voltage regulator.
its making my head hurt following wires. but if anyone has any feed back id love to have it!!
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
I have no idea what wire colors you're talking about. There is no purple-striped wire associated with the charging system and I don't know what "orangeish" is supposed to mean. But to answer your question, the ALT light comes on if the alternator stops producing current. You should verify this by measuring the voltage across the battery terminals with the engine running. This means you need to use a multimeter. Do you promise to do this?
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Freshman User
Joined: Nov 2012
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i checked the old ALT got Volts from alt to Postive side of Solenoid Wire[ the bat cable to check voltage in not out]
but i went ahead and got a new ALT installed check the Volts with a O meter. i got Volts comming from the ALT but the ALT lights still on and still aint charging the Batt
but i went ahead and got a new ALT installed check the Volts with a O meter. i got Volts comming from the ALT but the ALT lights still on and still aint charging the Batt
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
Half of what you write makes no sense.
First off, pay attention, when he asked what battery voltage you had, answer straight, not with a bunch of jibberish. Again, what is the voltage across the battery terminals with the engine running?
Second, you really need a wiring diagram. I'm sure if you seach around here a little you can find one.
Third, those alternators seldom fail, it's usually the regulator or something muddles up in the wiring.
First off, pay attention, when he asked what battery voltage you had, answer straight, not with a bunch of jibberish. Again, what is the voltage across the battery terminals with the engine running?
Second, you really need a wiring diagram. I'm sure if you seach around here a little you can find one.
Third, those alternators seldom fail, it's usually the regulator or something muddles up in the wiring.
Cargo Master
Joined: May 2009
Posts: 2,587
Likes: 47
From: Eagle River, AK
When I read that late last night, I thought it was just me being tired. Guess not.
This forum is a great asset and will definately help you along the way.
First off - Please use proper (or at least readable spelling) and punctuation, it will really help the people that may be able to help you read and understand your problem.
Secondly - While some members seem a little harsh and short with what they are requesting you to do..... Just think and do a little searching on this site and others, these folks are short because they are trying to make it very clear what information they NEED to help YOU find your problem and fix it. These folks also help lots of members worldwide and this is what we all do as a "side-job".
Anyhow, rant over.... I certainly hope you get your rig fixed.
This forum is a great asset and will definately help you along the way.
First off - Please use proper (or at least readable spelling) and punctuation, it will really help the people that may be able to help you read and understand your problem.
Secondly - While some members seem a little harsh and short with what they are requesting you to do..... Just think and do a little searching on this site and others, these folks are short because they are trying to make it very clear what information they NEED to help YOU find your problem and fix it. These folks also help lots of members worldwide and this is what we all do as a "side-job".
Anyhow, rant over.... I certainly hope you get your rig fixed.
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