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Testing a Starter Generator
Adding this little thing cause Alan mentioned it to me. "Don't bring the wire from the switch if it's a mag engine and to be careful doing it if you have a CDI or electronic ignition."
Adjustable wrench (fits every nut on the tractor very nicely haha)
Battery testing meter (I prefer one with clamp on ends for testing to see if batteries are good or not)
Step 1: With the starter generator still on the engine disconnect the wires from the starter generator.
Step 2: Hook the jumper cables to the starter generator first with the red (+) clamp hooked to the armature post; and the black (-) clamp hooked to the field post making sure the clamp is touching the case of the starter or it won't work as you are trying to ground the field of the starter generator.
Step 3: Before you forget, disconnect the ignition wire from the key switch and bring it around and clamp it under the positive battery clamp on the armature, otherwise the engine will not start.
Step 4: With the battery sitting beside the engine (I prefer the shop floor so you have plenty of room) Hook the other black clamp to the negative (-) post of the battery.
Step 5: Hook the black (-) clamp of your battery meter to the black (-) clamp of your jumper cables on the negative battery post.
Step 6: Set the engine up about 2/3 to 3/4 throttle and where it will for sure start and continue to run at a reasonable RPM, this is important to make the test valid.
Step 7: Clamp the red (+) clamp of your battery meter to the positive (+) battery terminal leaving room for access of your other clamp directly at the positive post.
Step 8: Being prepared to know the engine will start and run touch the remaining red (+) jumper cable clamp to the positive battery post and keep it there until the starter generator starts the engine (You may have to hold the negative clamp on the field against the starter generator case at this time).
Step 9: With the engine running and RPM climbing keep your eye on the battery meter. The gauge on the meter should be steadily climbing above 14 volts, reaching 15 and even 16 volts. If you see that then you know your starter generator is charging, and since it started the engine then you know it is operating both functions.
Step 10: If you are not seeing these results increase your RPM until you either reach full RPM or see the meter going up. If you never see the meter go up and you have reached the full engine RPM than the charging side of your starter generator is not working and needs to be rebuilt.
Finally pull the cable off the battery to kill the engine. It should die immediately, if not then pull the ignition wire off the clamp on the armature and that should do it. Congratulations on testing your starter generator.
Written by: Casey Shive
- Petenpole and ducky have said thanks