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EFV-8 Club Forum / General Ford Discussion / Bench TESTING a GENERATOR

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Discussion Topic: Bench TESTING a GENERATOR

sarahcecelia

12-04-2022 @ 11:01 AM

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Posts: 1196
Joined: Mar 2013

Back in the 60's, when I was a mechanic, and had just rebuilt a generator. An older parts mgr. (a fomer auto mechanics instructor) asked, "Is it gonna work?" I said ,"It should."

He then told me to put it on the floor. connect (+) and (-) jumper cables from a 12 V BATTERY to it- (1) to the CASE; and (1) to the ARM. post?
When I did it motored; and he said that it was good.

I know (1) cable (-) went to the case for a ground; but I can't remember what the other (+)cable went to? Was it the Armature post? I want to test if the generator is bad in my (12) volt car; to find out if it is bad; or is the regulator a wire connection; or wire itself, etc. bad.

Regards, Steve Lee

This message was edited by sarahcecelia on 12-6-22 @ 8:47 PM

fenbach

12-04-2022 @ 3:45 PM

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Joined: Dec 2009

steve,
looks to me like you answered your own question.

connect (+) and (-) jumper cables from a 12 V BATTERY to it- (1) to the CASE; and (1) to the ARM. post

you can check for an open winding by connecting an ohmmeter to GND and ARM, then ARM and FIELD. in both cases you should get a resistance unless a winding is open.

this site has a picture of a generator/regulator circuit. http://www.secondchancegarage.com/public/83.cfm scroll down to the Current Regulator section. you can see the sequence, GND - ARM - FIELD - REGULATOR - BATT.
bob

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