Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums - View Single Post - blowing main fuze
View Single Post
post #6 of (permalink) Old 03-09-2020, 11:31 AM
Thorn
Senior Member
 
Join Date: Nov 2015
Location: Pittsburgh, PA
Posts: 1,215
iTrader: (0)
 
Garage
+1 to what Spockster said. The stator will measure as shorted if it is plugged in to the R/R, but should measure open line if unplugged.

You were right about the white and white/brown wires ... the white is voltage from the battery to the ignition switch, and the brown/white powers some accessories, but is also the monitor wire to the R/R, so there's definitely a short somewhere either in the R/R or the stator. You should get an open line reading from the positive lead on the R/R to the negative lead on the R/R. Likewise, there should be an open line reading from the positive lead on the R/R to all of the stator leads.

Unfortunately, the brown wire has little to do with those leads, and shouldn't really be carrying any current, just a voltage the circuit uses to see if the bike is getting the right voltage out of the charging system. If that wire is melting, there's likely a short in the the thyristors of the regulator causing an uncontrolled battery dump.

If you're willing to sacrifice another fuse, unplug the stator from the R/R, but leave the R/R plugged in to the bike's harness and turn the ignition on. If it blows, you're for sure looking at a bad R/R (and the stator should still be inspected, since they tend to die in pairs). If the R/R alone doesn't blow the fuse, you're looking at a bad stator.

Chances seem pretty high that your R/R has failed. If you have to replace, it's highly recommended to get a mosfet replacement instead of the OEM shunt style.

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
Thorn is online now  
 
 
For the best viewing experience please update your browser to Google Chrome