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RD350 keeps blowing fuses

Started by Scuffed98, November 21, 2025, 03:15:04 PM

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Scuffed98

I was riding around on my RD350 and then it died suddenly. I took a look at my 20A fuse and saw that it was blown. Tried plugging in a new fuse and it would instantly blow the moment the contacts begin to touch.
Any ideas on what to check?
'74 RD350, 78 Peugeot 103

Scuffed98

#1
Some notes to make about the wiring that I see so far; PO removed the turn signals and converted the stock glass fuse to a blade type fuse. Also for some reason they cut off the brown wire coming from the voltage regulator output and hooked it with the red wire coming out of the fuse block.
'74 RD350, 78 Peugeot 103

quocle603

Confirm your grounds and make sure something isnt ground out.
Do not underestimate the power of a two-stroke.

1975 Yamaha RD350 (modified), 1973 Yamaha RD350 (stock), 1971 Suzuki T500, 1981 Yamaha XS650 HS2, 1982 Honda MB5, 1980 Puch Maxi, 1979 Puch Magnum, 1993 Tomos Bullet, 2003 Malaguti Firefox F15 LC

m in sc

yeah its got a dead short somewhere.  thats some sketchy ass wiring

Scuffed98

What kind of ohmic values should I be getting from my stator and rectifier? I'm reading taking my readings from the white connector that hooks up the stator to the rectifier. From my stator I'm getting a reading of .6Ω from each connector and from my rectifier I keep getting 11kΩ from each connector. Assuming I'm not taking my measurements wrong does this mean either/both my rectifier and stator are basically fried now?
'74 RD350, 78 Peugeot 103

quocle603

I am almost certain that the manual has those values
Do not underestimate the power of a two-stroke.

1975 Yamaha RD350 (modified), 1973 Yamaha RD350 (stock), 1971 Suzuki T500, 1981 Yamaha XS650 HS2, 1982 Honda MB5, 1980 Puch Maxi, 1979 Puch Magnum, 1993 Tomos Bullet, 2003 Malaguti Firefox F15 LC

SoCal250

Stator white wires: 0.3~0.35 ohms for each.  As long as you're fairly close to the spec and all are even (and none showing open) then you should be OK.
For the rectifier there is a series of tests that must be performed with the black, red, and red/white wires to the white wires in the connector. As mentioned above, it's in the manual
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