I wanted to have a 12v accessory on my machine, which is a 96 TundraII with no electric start. Had it had electric start this would not have been a huge issue, just run some wires from the battery or nearest power wire with 12v and then to a ground and bam! 12v power. However this was not the case. But I did learn some things. Like snowmachines create AC while one needs DC to run a 12v accessory. I also learned not to use your good phone charger when you make your first attempt at wiring an accessory to your machine. After a week or so of this or that and researching I finally found the best(simplest) schematic on how to wire up a system to convert the AC voltage that my machine puts out to 12v of DC. I would like to thank John out at 90's and older snowmachines who explained how and what I needed very well so that even I understood it. His suggestion was to also run this 12v power to a small battery first then connect the battery to the accessory. I have not done that yet but may in the future. All in all for around 20 bucks and some basic soldering skills I have a 12v accessory on my snowmachine that I can run a GPS, phone, fishing finder or whatever else runs on 12v, and I did it myself which is always fun. I will probably hookup the small battery later as that would allow me to run/charge things while the machine is not running. Here is website that I found the scematic on.
I followed the advice of one of the other posters and put only a 10uF capacitor going to the final postive from the regulator to the accessory. Other than that I followed the schematic and it worked for me. I repeat it worked for me, It may not work for you. So dont blame me if you burn up your wiring. I did alot of testing with the voltmeter before I committed to hooking anything up(the second time). If you give this a shot I hope it does work out. Good luck.