I posted about a year ago with some questions about a engine swap in my custom built dune buggy I named "Frankenbuggy" https://atvconnection.com/forums/pol...ggy-lives.html
At that time I was swapping out an air cooled 250 Trail Blazer motor and installing a liquid cooled 400 motor. The swap was very successful and a lot of fun to drive.
I had the opportunity to obtain a 97 Polaris 700 RMK snow mobile that was trashed body wise but the engine was very strong and with much peer pressure from friends and some encouragement from my son I took the leap and pulled the 400 and installed the 700 snow mobile engine.
This year and model of Snow Mobile was not electric start so had no on board battery and everything ran off the engine electrical system. Since the buggy is an off road vehicle it cannot be cooled using snow so I installed a larger radiator and electric fan to cool the engine. After splicing into the hand warmer circuit of the snow mobile to power the cooling fan I found out that I needed a Battery wired into the system so that the fan would operate properly.
I have the voltage regulator/rectifier from the Polaris 400 engine I removed and now I need help on which wires get spliced from the Polaris snow mobile engine to the Voltage Regulator/rectifier to keep the battery charged.
I have wiring diagrams for both engines but I'm stumped
Sorry about the long post but I thought it was important to give as much background about my project as I could.
Old Polaris Tech your help last time was the best and I hope you have time to give me a suggestion or 2 to lead me in the right direction.
Thank you.

 

Wow.. I've got time,but looking at the parts breakdown on the Rmk doesn't even show a regulator,so I guess this thing operates like dirt bikes. Somewhere in your schematic should at least be wiring for an ac regulator coming from the stator as I suppose the snowmobile had to have had lights of some sort. That's where you need to concentrate on. Changing the ac regulator wiring over to the dc regulator wiring from the Trail Blazer for the battery.This is where you'd need some sort of converter like this one.https://www.superbrightleds.com/more...r-module/1725/ or a bridge rectifier from the stator wires then hook it to the Trail Blazer regulator/rectifier and then the battery. Not that familiar with snowmobile wiring or snowmobiles for that matter down here in Texas.. Maybe this video on wiring up extra lights to a dirt bike could help.

 

I looked up the same year snowmobile (different model that had an electric start) and it shows the yellow wire from the stator going to the regulator and then to a rectifier then to the battery. The trailblazer has a regulator/rectifier as 1 unit so in theory I should be able to use the reg/rec off the trailblazer and just wire it up like the trailblazer.There is an extra wire coming from the reg/rec (yellow/red stripe) and I'm not sure where to connect that one any idea what the yel/red wire does on the trailblazer? If I can get that solved I should be ready to go. Sometimes it is a big help just discussing the problem with someone else and more often than not you get it figured out. Thanks again OPT . . the most valuable under paid guy on the net!

 

If you look at the wiring schematic on the atv the extra yellow/red wire from the regulator ties into the reverse speed limiter. Don't think you'd be needing that wire on the snowmobile.. Just tape it up out of the way and see what happens.

 

I'm gonna give it a go and hopefully i won't let the factory installed smoke out of everything . . .lol
Thanks again and I will let you know what happens.

 

hello sir I've got some surging problems with my 330 trail boss. I've cleaned my carb.I did a compression check and leak down test.. I've found that I have a burnt exhaust valve. However, I do not believe that fixing the valve will fix my running condition. I believe this because the atv will operate properly until slightly passed quarter throttle. Please help

 

Don't just try to clean a carb,may not solve anything. Tear it apart,blow out every orifice and install a carb kit. Here's one of the better ones made in Japan.Shindy Carburetor Carb Rebuild Repair Kit for Polaris Trail Boss 330 2003 2007 | eBay Look at the pdf on your carb.May help on float adjustment,etc.https://www.google.com/url?sa=t&rct=...U2gGlaHJWSIlbA Plus don't overlook all the parts in the carb slide. If parts are missing or out of place,can cause problems on taking throttle. Especially items #1-4. Dirt Cheap Yamaha, Polaris, Suzuki & Kawasaki OEM Parts & Accessories – Cycle Parts Warehouse

 

That didn't work. I hooked it up as we talked about in previous posts and I got .308volts from the red wire coming from the Reg/Rec . . very disappointing.
It just so happens I have a Reg/Rec from another 96 Polaris 4 wheeler 250 (the original engine) and this one does not have the extra yellow and red wire I had to tape off so I'm gonna give it a go and see what happens.
Can you tell me what is needed to add a battery to a dirt bike or ATV so that the electrical system can charge the battery? I have heard this can be done but never seen it or heard details of how to do it. If I cant get this to go with this new Reg/Rec I will just approach this like its a dirt bike and try wiring it that way.

 

Only way then I can figure is you still have to have a bridge rectifier changing ac voltage to dc. Don't know if this simple way this guys is doing it will help you. If it doesn't then may be just as simple to run the RMK as it was designed and forget about the battery.