Supercoyote
XS400 Enthusiast
Recently replaced my regulator with the common R292, wired a direct ignition relay supplying power to the coils and cleaned up some wiring (including rewiring the field coil and investigating stator wiring). One issue i've been having is that when I turn the ignition on (but not started) i'm getting a fairly big voltage drop even with lights off and bulbs unplugged. Roughly between 0.75V to 1V once it settles out. If I unplug the regulator it climbs back up maybe 0.4V, but I would assume that's due to the voltage required to magnetize the field coil (of which it is magnetizing quite effectively). As well, the rectifier tested good for open one direction and some resistance in the other, but what is considered proper resistance numbers? Mine were still high, around 400 M ohms, but i'm not familiar with the operation of diodes and what's normal or not.
Two things of interest that I have yet to properly interpret
1. Measuring voltage between the battery and the brown wire going to the regulator gives me roughly a 1 volt reading
2. When running the engine, the reg works great, i'm charging no problem and it's properly limiting voltage, but it's limiting it to ~13.5V instead of 14.x V measured at the battery.
I ran down the line of checking voltage down the main power line, and this was an issue of major voltage drop before the ignition relay so I don't suspect it being the culprit. If a there was a dirty connection at some point in the line, could it "fool" the regulator into thinking it was putting out a proper 14V at 4000rpm when it's somewhere south of that, around 13.5V or lower volts? I've tried to interpret the wiring diagram, but would it make sense that the voltage "leak" would be after power leaves the regulator and before it hits the battery?
Two things of interest that I have yet to properly interpret
1. Measuring voltage between the battery and the brown wire going to the regulator gives me roughly a 1 volt reading
2. When running the engine, the reg works great, i'm charging no problem and it's properly limiting voltage, but it's limiting it to ~13.5V instead of 14.x V measured at the battery.
I ran down the line of checking voltage down the main power line, and this was an issue of major voltage drop before the ignition relay so I don't suspect it being the culprit. If a there was a dirty connection at some point in the line, could it "fool" the regulator into thinking it was putting out a proper 14V at 4000rpm when it's somewhere south of that, around 13.5V or lower volts? I've tried to interpret the wiring diagram, but would it make sense that the voltage "leak" would be after power leaves the regulator and before it hits the battery?