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Hello, I have a problem with energy in trx400ex. Battery will not charge. Battery is good. but the problem is with meybe, voltage regulator " for ex: DO QUADÓW - ELEKTRYKA I O?WIETLENIE - REGULATOR NAPI?CIA :: Motomaniak before buying wants to be sure of his fault - Can you tell me How many the voltage should be on the red connector between the battery and the regulator:(:( Thx
 

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12vdc - the red wire from the voltage regulator connects directly to the red wire going to the battery. The wire should have battery voltage when the engine is stopped and it should have about 13.5 to 14.8 volts when the engine is running at about 2000 RPM
 

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Check the connectors near the battery/starter solenoid area. I had the same problem and it was just a corroded connection. Even after doing the test procedure im my repair manual I almost wasting money on a new reg/rectifier but luckily I found the bad connection. Put a dab of dielectric grease on them after cleaning before hooking them back up.
 
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