Andy, see http://www.ttalk.info/Holcombe.htm as a follow up to Dave
DuBois' response.
Bud Krueger
http://www.ttalk.info/
Andrew Moyce wrote:
>A follow up on my generator probem. I finally got time to take it apart
>and found that the bearing at the brush end had worn out of round,
>allowing the armature to rub against the field coil . . . There were
>areas of abrasion on both. This no doubt started with torque on the fan
>pully caused by the fractured tensioner bracket.
>I pulled a bearing from a defunct generator I had laying around and
>pressed it in, but only get a reading of 1 -3 volts. I guess I could
>keep fiddling with this but it may be best to replace the generator and
>be done with it.
>
>Comments?
>
>Andy Moyce
>52 TD
>-----Original Message-----
>From: Dave and Liz DuBois [mailto:ddubois@sinclair.net]
>Sent: Monday, June 11, 2007 1:41 PM
>To: Andrew Moyce
>Cc: 'mg-t net'
>Subject: Re: Generator problems
>
>Andy,
>
>I doubt that the generator is bad, but here is a procedure for checking
>the generator and if it is good, a quick check of the
>generator/regulator together:
>
>Check the generator/dynamo by disconnecting the wires from its
>terminals, connecting the two terminals together and to a 20v voltmeter
>(analog meter, not digital). Start the engine - DON'T rev it!! - just
>slowly increase the revs watching the voltmeter. It should get to 20v by
>the time you get to 1000 rpm. DON'T exceed 20v. If that checks out
>reconnect the wires to the dynamo with the voltmeter on the D terminal
>(brown/yellow wire) and again start up and slowly increase the revs
>watching the voltmeter. The voltage should rise then stabilize at about
>14.5v, it goes higher again don't let it go over 20v. If it stabilizes
>at 14.5v it is charging OK.
>
>If the generator checks out good and the regulator is the culprit, I
>would suggest contacting Bob Jeffers at: bobj20@comcast.net and ask him
>about changing your regulator to a sold state version. the cost is
>about the same as a new regulator, but you get one that is calibrated to
>the generator that you are using, that regulates much closer than the
>mechanical ones and the case comes back buffed to a high shine.
>
>Be sure that you don't over tighten the fan belt or you will damage the
>generator - See my article regarding fan belt tension at:
>http://www.omgtr.ca/technical/tdtf_fan_belt/loosen_up.htm
>
>Cheers,
>Dave
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