Delco Remy 6v Generator

6704bc · Aug 13, 2016

Works OK as a motor (jumper between terminals A&F and battery feed to A). With the belt connected there is no voltage generated. Any ideas ? Thanks !

Janicholson · Aug 13, 2016

Disconnect the "F" terminal and run bat voltage to the A terminal only. It should run as a motor. Now, while it is running as a motor, jumper between the F and A. it should slow way down but not stop. If it does not change speed, the field is "open". use a ohm meter to measure between the F terminal and the A terminal. if no connection (infinite ohms) the field is not connected internally. It should read less than 5 ohms. If a three brush gen, check the resistance between the 3rd brush and the F terminal. No connection "infinite" is bad. Jim

John T · Aug 13, 2016

If you work through my Troubleshooting Procedure it can help find the cause of no charging.

If you ground the FLD post and apply voltage to the ARM post and case ground and it spins like the DC motor it is, that tells me the armature and brushes are in at least decent shape. Then if you unground the FLD she ought to spin faster tells me the field windings are in place. If no change in speed when you unground the FLD, I suspect a field problem. Usually if it passes BOTH tests (runs with FLD grounded and spins faster if ungrounded) it will charge.

If not work through my procedure linked below.

PS In a Class A Generator one end of the two series field windings is already connected to the ARM (or via a third brush in a 3 brush genny) with other end terminating at the FLD post, so I don't understand your jumper between A & F ??? She can still spin with the field essentially shorted to itself by connecting A to F, but I start with F grounded then see if she speeds up when ungrounded.

John T
John Ts Troubleshooting

John T · Aug 13, 2016

Yo Jim, isn't this a Class A Generator??? One end of the two series fields is already wired internally to ARM (unless a 3 brush then via the third brush and commutator then to ARM post) with the other end terminating at the FLD post, so jumping A to F shorts the field to itself, one end to other end, same voltage on both ends so no field current flow right??? If there's nothing connected to the FLD post its just sitting there an open circuit (again no field current flow) so I don't understand any RPM difference if A is jumped to F OR NOT jumped??????? HELP ME OUT HERE.

I always started the Motor Test by grounding the FLD post so it conducts current from A to ground creating a back EMF which slows the RPM but then if you remove the ground jump it speeds up. Initial spins tells me arm and brushes are okay and then if it speeds up if FLD ground is removed tells me fields are in place and conducting.

Hey Ive been wrong before MANY TIMES lol

John T

6704bc · Aug 16, 2016

THANKS TO YOUR INPUTS MY GENERATOR IS CHARGING. THE PROBLEM WAS THE AMP METER.

Delco Remy 6v Generator

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