high voltage
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high voltage
1982 f 150 inline six . 4 speed manual . alternator is charging battery at 16.8 volts while i am drivng . with hi beams and blower on high . sound like a voltage regulator ? battery is new and alternator has new brushes and bearings . with no headlights and blower off , iy charges over 17 volts . if i let it sit for a day or two . theres not enough juice in the battery to even turn her over . I took the field wire off the alternator and it stopped discharging . It also won't charge the battery with the field disconnected . Is it possible that the diodes in the alternator are damaged ?
FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
As I'm rebuilding an alternator at present, I'd say get a rebuilt one. I'm going to have more in mine than a rebuilt would cost. Your local parts store can test yours and sell you another if it is bad.
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
Most parts stores will only check output.
Check for backflow yourself if you have a multimeter with diode test.
Just ohming it out often won't put enough current to the diode. (depending on your meter)
A regulator is cheap, but check first to make sure yours is getting 'sense' voltage from the system.
Could be a broken wire or a corroded plug if your regulator is that style.
Check for backflow yourself if you have a multimeter with diode test.
Just ohming it out often won't put enough current to the diode. (depending on your meter)
A regulator is cheap, but check first to make sure yours is getting 'sense' voltage from the system.
Could be a broken wire or a corroded plug if your regulator is that style.
Logistics Pro
Joined: Sep 2011
Posts: 4,491
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From: Algona,WA
Not sure which alternator you have, if it's the 1G or 2G. But I just bought a rebuild kit for mine and a new slip ring for $35. New brushes, holder, springs, new HD rectifier, new slip ring, new voltage regulator. Local parts store wants $70 for a china reman 2G... I'll do it myself and do a better job at it than they do. Sounds like yours is pretty messed up.
Edit: noticed yours is an 82, so it should be a 1G. 86 was the first year for the internally regulated 2G fire hazard.
Edit: noticed yours is an 82, so it should be a 1G. 86 was the first year for the internally regulated 2G fire hazard.
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Freshman User
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yup . External regulator . Have a Motorcraft regulator coming in a few days . That should solve the overcharging deal . I had a guy put new brushes an d bearings in the old alternator , still may need to replace the diode trio . We'll see . One thing at a time !
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pedant
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