Guitar618 Posted May 2, 2015 Share Posted May 2, 2015 Hey guys, I am a new to this forum. I have been racking my brain with this. Here is my dilemma: I just bought a Yamaha Seca xm400j. My problem is 2 fold. I am having an issue finding a new gas tank for it, either used, oem, or aftermarket. The tank has a hole in the right side that the previous owner fixed with JB Weld, and it looks shotty at best. Holds fuel but cosmetically unappealing. I am also having a problem with the charging system. A new battery was installed after sitting all winter, but the bike will not charge the battery. Stator is good, and a new regulator was installed. Anyone else out there have this problem or know of anything else that might help? Link to comment Share on other sites More sharing options...
neversaydie Posted May 2, 2015 Share Posted May 2, 2015 Cant help with the tank, just keep looking, unless you can find someone to cut out the damaged section and weld a piece in You need to check what voltage the bike is giving out. Im guessing it needs to be 13volts to 14.5 volts to the battery. Youll need a multi meter with the engine running at approx 3k rpm An intro in the New Members area may result in additiional assistance Link to comment Share on other sites More sharing options...
Guitar618 Posted May 2, 2015 Author Share Posted May 2, 2015 Thanks, yeah I think I am going to just try to fix the tank. I did check the battery while running and it reads @12.5 at 3000 rpm. Going to try to clean all of the connections to see if that helps. I read that corrosion on the connections can cause resistance, so I will try that today. Also going to check the ground. I have heard that it is a common issue with them. Fingers crossed!!! Link to comment Share on other sites More sharing options...
neversaydie Posted May 2, 2015 Share Posted May 2, 2015 Yeah, sounds like thats the area to look at, 12.5 v is not enough at 3k You may find this useful http://www.electrexworld.co.uk/acatalog/Troubleshooting-3P-PMG-&-RR.pdf Link to comment Share on other sites More sharing options...
Guitar618 Posted May 16, 2015 Author Share Posted May 16, 2015 Okay, so I checked the stator and it checks out okay. The rectifier is brand new, but I checked it just in case and it passed. Charged the battery up to a full charge (@12.5v). In checking the voltage to the brushes I found that my green lead (negative) is sending @10.55v which doesn't sound right. and the brown (positive) is sending @11.5v. This can't be right. Link to comment Share on other sites More sharing options...
Guitar618 Posted May 16, 2015 Author Share Posted May 16, 2015 So basically my rotor isn't getting the proper voltage to create a magnetic field, and for some reason my negative lead is sending voltage. Link to comment Share on other sites More sharing options...
Tommy xs Posted May 16, 2015 Share Posted May 16, 2015 Had a similar problem on mine turned out to be the wires coming from the pickup coils were oil soaked and needed replacing Link to comment Share on other sites More sharing options...
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