Charging Issue

[elgranjefe]

Hello XSers,
‘79 XS1100: Bike wouldnt start, had electrical shop fix it, found a broken wire. Now, bike will run but dies after warming up. Bike is getting barely 12 volts at 3K RPMs. Is that normal? Any ideas where to look for fix?

Thanks,

Jeff

[motoman]

Originally Posted by elgranjefe

Hello XSers,
‘79 XS1100: Bike wouldnt start, had electrical shop fix it, found a broken wire. Now, bike will run but dies after warming up. Bike is getting barely 12 volts at 3K RPMs. Is that normal? Any ideas where to look for fix?

Thanks,

Jeff

I suggest starting with battery. P,ut a 1amp charger on batt. for a few hours, then check batt. voltage. should be at 12.8-13.1 volts. If that checks out good, key on, no running bike, unplug and check stop/run switch at its plug-in. Should be the same as batt. This COMPLETES the electrical running circuit. If not, remove stop/run switch, dissasemble and clean those brass contacts as THIS switch completes the running circuit and contacts NEED to be clean and IS a common voltage failing area. This IS a good starting point, and let us know what you find out before continuing.

[motoman]

BTW, plug-in for stop/run switch is under fuel tank against right top frame rail.

[elgranjefe]

Will do....thank you!

[skids]

I suggest that you check and clean the clip connector behind the fuse block. There is a 4 wire clip there from the stator (generator) that is prone to corrosion and once that happens, one or more contacts will arc and get real hot. The clip will be 3 white wires and one yellow, although the yellow one usually looks white as well.