I checked the stator and the ohm is between 1.2 and 1.1. when i rev the engine the volt meter shows a decrease in voltage. i also checked all the connections to make sure there was no corrosion i found one that was. I cleaned it and still nothing.
Right side of machine, remove the cover below the battery box, you will have to remove or loosen front exhaust. the regulator is a finned black box held in with two 10mm hex bolts. remove regulator and disconnect the connector. the three white wires are the a/c input to the regulator. start the engine and at high idle, there should be 42 volts between each of the wires, make sure you test all of the wires and there is no missing voltage between a pair which would indicate that one phase is not working. if all is well, ohm black wire to ground on engine to make sure the ground path is good or the regulator will not work. reconnect the regulator, hook volt meter across the battery and notice reading, then start the engine and run up the rpm, you should see a voltage rise. if it does not, the regulator has open diodes. as a note, if you do not get an a/c reading at the regulator side, remove cover under tool box and check the alternator by doing the same wire pairs as mentioned before at the connector side going into the engine. if you have a/c there, check wiring from other connector side to regulator. if you have no a/c then you have a bad stator. yamaha uses a 3 phase permanent magnet alternator and the coil resistance should be around an ohm. this reading is relative unless you have a good meter as resistance of the leads and how well of a connection you made will affect the reading.
Hi and welcome to FixYa,
Your described condition indicates a most likely fault with the voltage regulator. This would be located below the battery. In most instances, it would be the regulator itself. However, there are also occasions where the pins/terminals of the connectors are corroded or have burned due to overheating.
Good luck and thank you for using FixYa.
Appreciate the quick postback. A few ideas to consider/try:
Cheers.normally, there would be 3 wires coming from the stator going to the regulator;
AC voltage measured on any pairing of these wires would be higher than 12 depending on the RPM above 1200;
DC voltage output would tend to vary from 12 to 13.8/14.2 depending on the RPM;
the best check would be to install temporarily an ammeter inline with the wire coming from the regulator going to the + terminal of the battery. With this, the presence/absence of the charging current could be checked.
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Is there any way of checking the voltage regulator on that 2002 yamaha v star 1100?
How do you remove the stator once you determine this is the problem?
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