04300exc

Initial symptoms: no fan, no oil light when first turn on key. I hot wired fan..it's good. I repaired wire to sensor switch... but still no light or fan. Replaced fan control unit (FCU) and sensor switch....if I ground the sensor wire, the fan turns on, but I still have no oil light ( all oil light wires check out fine, bulb is good...its not getting a ground signal from new fan control unit)....interesting, I replaced the new FCU with the old one again...and oil light will come on for a couple of seconds, but with old FCU when I ground the sensor wire, the fan will not come on. My speculation is that the new FCU (china) does not operate exactly the same as the OEM. I ran the machine at idle for several minutes, but could never get hot enough to get fan to turn on. My laser temp gun reads just over 200 def F at engine case. I am hoping that driving the machine today and getting it hotter will activate fan....but again, no oil light when first turning on key.

Running again! Thank you for your help. I ended up replacing the rectifier, CDI box, and new coil - now I am trying to resolve fan problem.

Hey guys - first time here - working on my 1995 Honda foreman 400...it has no spark. During the diagnosis, I get continuity from the green wire in the 5P connector from the stator to the yellow wire in the 4P connector plug at the ICM.... so basically the yellow wire is grounding out. If I disconnect the rectifier connector plug, the yellow wire at the 4P ICM plug is no longer grounded.... but still no spark to plug if rectifier connector is unplugged. so.... does rectifier have to be plugged in for spark at plug?? This is the only thing I have found - ran a lot of diagnostic checks, and everything seems to check out ok - the stator itself, when unplugged seems to test ok, but I have read that sometimes they can still be bad??? I have replace ICM and Rectifier..no luck. Any advice is greatly appreciated. Also, I did try to check AC voltage from yellow stator wires by just cranking engine.... but did not know how much voltage I should see on my dvm.