![]() ![]() If it's a brush type genny the diodes are normally about 6 amps minimum rating or 10 amp average and a PIV (peak inverse voltage of 200 to 250 volts. You might also try a google search for good info to your questions about how to test diodes and cap? Try all this first and let us know what you get. Then read each lead to the frame of the generator with ohmmeter set to highest point. Read the excitor leads with cap disconnected. If cap passes above test, you will need to ohm the excitor leads. If this happens more than likely the cap is ok. Should jump from low ohms to high as cap charges. Set ohm meter at highest setting and read the cap terminals with the leads. With generator shut down disconnect the wires from the cap. If not you will need an ohm/volt meter to further test it. If it has lost residual magnetism this will restore it. If you can reach the terminals of the cap while gen is running with excitor winding leads attached momentarily touch 12 volts dc across them. A lot of smaller generators use a cap for excitment. If there is no + or - on it, it's an ac motor run cap. ![]() First of all is the capacitor external or internal? If you can read the numbers on the cap that would be helpful. ![]()
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