reg/rectifier blowing fuses???

[frenchy]

I bought brand new reg/rectifier, stator, & rotor from electrosport. Hooked everything up. Good to go right? Wrong, bad stator. Electrosport sends warrantied stator. Install. Multimeter tests pass. Good to go, right? Wrong. Start up bike, rev to check voltage, fuse pops. Disconnect all electrical and install new fuse. Start plugging things back in to see where the issue is. Seems either stator or reg/rectifier. Stator passes multimeter tests, but reg/rectifier fails diode test. But i'm trying to wrap my head around why the reg/rectifier would blow fuses when the key is turned on but the engine is not running. Could somebody please enlighten me?

Thank you.

 

[frenchy]

Anybody? Any ideas?

 

[Rocan]

might have a short that bypasses voltage regulator, or voltage regulator is faulty.

check what voltage your getting out of the regulator. should be 12v. if more than 13, its probably faulty. some 12v batteries put out close to 16 volts (ive seen 15.6) when fully charged.

 

[crazypj]

Red wire from battery goes direct to rect/reg.
If diode is passing current both directions it will 'feed' into stator causing it to overheat (and usually fail)
If you have Red going through main fuse before it gets to reg/rect, the extra load of coils/lights/etc will overload circuit and fuse blows when you turn ignition on

 

[locOleoN]

What bike is it?

I had the EXACT same problem on my 2000 gsxr750...

the problem was the wiring harness just before the connector to the reg/rec..

It was melting due to the resistance build up between the connectors...(gsxrs are notorious for that...)

check your wiring harness just before the reg/rec plug... Its bet is crispy, melted and the wires are grounding out...

That problem would actually destroy your reg/rec.

 

[frenchy]

Thanks for the replies, gents.
I am embarrassed to say, but the reg/rect. turned out to be fine. The problem with the funky readings was actually my multimeter. After using a better multimeter I found that the reg/rect was fine, but there was a short at the rotor brushes. One of the wires was contacting the rotor and shorting to ground. After I repositioned the wire and wrapped it in tape, it turned out to be fine. The charging system seems to be working as it should.

I know, stupid mistake. I didnt think to check the multimeter.