Posts: 1120
Location: West Chester, OH | I'm not familiar w/your particular motor but I can say that every other rectifier & regulator that I have known were strictly integral to the charging system: Regulator governs the voltage going back to the battery from the alternator. Rectifier converts AC from the alternator to DC for the battery. Have a difficult time imagining that either of these would cause an "overheating alarm."
How much engine function (temp., timing, etc..) is controlled by computer? Are there sensors to monitor these functions? Have had some bad experience w/electrical components that failed under temperature-specific conditions: an anti-knock sensor in our van that caused random loss of ignition spark until engine reached normal operating temp & an ignition "black box" on a Merc outboard which caused random misfire under warm-up. Parts changers @ the dealership took 2 days before discovering a service bulletin about the anti-knock sensor. Finally fixed the Merc myself after 2 different shops "fixed" different things.
I agree w/Theedz - you're working w/parts changers. I'd try a few inquiries further up the food chain. Someone @ OMC/Bombardier may be able to steer you to a really seasoned mechanic or possibly they have a file of service bulletins like the one that bailed out my Dodge dealer.
Good luck. My favorite mechanic, who has lots of experience w/British & Italian stuff, says that electricity is either working perfectly or driving you crazy.
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