The diode that controls the field circut is probably gone. It is in the diode
pack in the alternator.
Steve
wizardz@toad.net wrote:
> Alternator was flaking for a while there.
> Every once in a great while I would notice my head lights get really bright.
> Well after installing a voltmeter I can attribute that happenstance to
> the regulator going up to 20 + volts
> I'd pull over... (slowing the engine) wait a second and it would recover.
> Back up to speed..volt meter at 13-15 volts.... a ok
>
> Well tonight I noticed the idiot light on... volt meter reading 12 volts
> rev it to 12-1500... nothing. run up to 3Krpm... it goes out. ...
> Nope...no good it's now back on.
>
> Ok.... drove it home from work half on charging...half on battery.
> Swiped the alternator out of the midget and stuck it in the B.
> Well even at an idle, the alternator is kicking out 13.8-14.01 volts.
> BUT THE LIGHT IS STILL ON!
>
> I've checked the white ckt wiring all the way back from the idiot light, to
> the
> ignition switch, to the fuel pump, to the O/D harness, to the tach, and to
> the coil.
>
> At the ign. switch both the brn and WHT ckts have 14.01 on them.
>
> I'm under the impression there is a electrical block connector that ties
> all the WHTs together somewhere under the dash that the ign. sw. WHT wire
> goes to.
> That block is also the connection for the other WHT feeds.
>
> QUESTION: If the WHT wire was coming loose at the block wouldn't
> a higher resistance here at this connection only limit the voltage through
> the
> idiot light. If limited...why would it glow?
>
> Paul Tegler wizardz@toad.net http://www.teglerizer.com
> OBie - '73 BGT - daily driver
> http://www.teglerizer.com/mgstuff/ob_description.htm
> Punkin' - '78 Spitfire - corner ripping screamer
> http://www.teglerizer.com/triumphstuff/spit78.htm
> Lil' Greenee - '73 RWA Midget - lady killer
> http://www.teglerizer.com/midgetstuff/index.html
>
> Paul Tegler wizardz@toad.net http://www.teglerizer.com
> OBie - '73 BGT - daily driver
> http://www.teglerizer.com/mgstuff/ob_description.htm
> Punkin' - '78 Spitfire - corner ripping screamer
> http://www.teglerizer.com/triumphstuff/spit78.htm
> Lil' Greenee - '73 RWA Midget - lady killer
> http://www.teglerizer.com/midgetstuff/index.html
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