12 volt gen.
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Joined: Dec 2004
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From: Texas! Ya mean there's someplace else?
RE: 12 volt gen.
ORIGINAL: wreck74
hello,does anyone know how to bench test a 12 volt harley generator ?
hello,does anyone know how to bench test a 12 volt harley generator ?
Seasoned HDF Member
Joined: Dec 2004
Posts: 11,068
Likes: 1,473
From: Texas! Ya mean there's someplace else?
RE: 12 volt gen.
Hmm, everything I show sez the 58 series was 6 volt. But I have seen some 6v gennies converted to 12v, so ...
Here's what I have on testing them.
1. Remove wire from generator "F" terminal. Connect a jumper wire from "F" terminal to ground.
2. Remove wire(s) from generator "A" terminal and connect to positive side of 0 - 30 amp ammeter.
3. Run engine at 2000 rpm, and briefly connect negative lead of ammeter to positive battery terminal.
**** Don't run engine for too long with generator field grounded.
**** Disconnect ammeter lead from battery before stopping motor.
4. If ammeter reads 15 amps or more for 6v gennie, it's OK. If ammeter reads 10 amps or more for 12v gennie, it's OK.
5. After reconnecting the gennie wires, flash the field coils to polarize the gennie. Do this by briefly touching a jumper wire between "BAT" & "GEN" terminals on the regulator before starting the engine.
Unless you're restoring this beastie, cop a solid state regulator. It'll last forever and help the gennie last, too.
Here's what I have on testing them.
1. Remove wire from generator "F" terminal. Connect a jumper wire from "F" terminal to ground.
2. Remove wire(s) from generator "A" terminal and connect to positive side of 0 - 30 amp ammeter.
3. Run engine at 2000 rpm, and briefly connect negative lead of ammeter to positive battery terminal.
**** Don't run engine for too long with generator field grounded.
**** Disconnect ammeter lead from battery before stopping motor.
4. If ammeter reads 15 amps or more for 6v gennie, it's OK. If ammeter reads 10 amps or more for 12v gennie, it's OK.
5. After reconnecting the gennie wires, flash the field coils to polarize the gennie. Do this by briefly touching a jumper wire between "BAT" & "GEN" terminals on the regulator before starting the engine.
Unless you're restoring this beastie, cop a solid state regulator. It'll last forever and help the gennie last, too.
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RE: 12 volt gen.
Thanx for the info. heres the stamping it's a fan cooled gen.
12 V
harley davidson
made in usa
model 58 R
12 V
harley davidson
made in usa
model 58 R
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Seasoned HDF Member
Joined: Dec 2004
Posts: 11,068
Likes: 1,473
From: Texas! Ya mean there's someplace else?
RE: 12 volt gen.
ORIGINAL: wreck74
Thanx for the info. heres the stamping it's a fan cooled gen.
12 V
harley davidson
made in usa
model 58 R
Thanx for the info. heres the stamping it's a fan cooled gen.
12 V
harley davidson
made in usa
model 58 R
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RE: 12 volt gen.
i don't know the history on this gen, ive had it for five years with no problemes,till now. it has only two leads,armature looks good,brushes are too short. does anyone know where to get a set of brushes for this gen ? i ordered a set from J&P but were the wrong ones. (it's a two brush) with the wire that goes through the spring. an allmost sqaure looking brush, not skinny and rectanguler, any help would be appreciated.