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I have the identical machine, '08 Trail Touring 550 fan, bought used about 4 years ago. It came with all of the cooling additions you've described already installed. I don't know if that was done by the first owner or factory. Despite all of the warnings herein about 550 fans that overheat, I...

Thanks. Certainly possible that it was removed although I can see no damage to the book. I also found one that will do the job. Appreciate your help.

Thanks guys. We finally have snow. Looks like a good year so I've been working on my '08 550 Edge. First step was to replace the Voltage Regulator. We'll see how that works. But why is it so difficult to find a wiring diagram (electrical schematic) for this sled - and others? I have a '01 335...

Any ideas on how to remove stick-on numbers from the hood without damage would be appreciated.

My '08 Trail Touring Edge (550) starts & runs great! The battery is getting charged &, at idle, the lights are bright, the Tach works. But .... rev it up a bit (the exact rpm varies) & the lights go dim (on battery power only??) & the Tach drops to zero. There is precious little information in...

Thanks guys. I'm off to the garage. I have seen that regulator in the footwell & will remove it. I think the service manual has a method to check it but I may just replace it. I'll also check every connection on the machine, ground & live, to ensure they're all secure. Your suggestions make...

My 550 Trail Touring starts & runs perfectly but, when I rev the engine whether on a stand or on the trail, the lights suddenly dim & the tachometer drops to zero. Let off on the throttle and things are fine again. The engine does not seem to be affected. Any thoughts before I start ripping it...

Thanks again 850. Great help. I'll let you know the outcome.

Wow! Thanks 850. I will check that today and let you know the result. Keep your fingers crossed.

Still having trouble. Checked every wire & connection I could find. Battery's good, electric starter working fine, everything seems to be perfect .... until I rev the engine. Then the lights dim to maybe 1/2 power and the tach drops to 0. If I let it idle down, everything is good again. Getting...

Thanks for the good news! I do thank you for responding. I was afraid of that. I'll try to check it out without removing it.

I hate electrical problems!! My near-perfect '08 Trail Touring (550 fan) starts and runs like new, but ... when I rev up the engine just a bit, like from 2000 to 3000rpm, suddenly the lights go dim and the tach drops to 0. The engine keeps running just fine! I've checked all connectors &...