So, to try things out a bit, I turned my heated grips and heated throttle on high while plowing today. I also turned on my pair of 55 watt HID headlights (it was daytime, but wanted to see if there was an issue). I plowed for over an hour with no issues. I was continually raising and lowering the plow and never saw a drop in power.
A few notes on my setup:
- 2014 Sportsman 570
- Warn Provantage 3500 winch
- Warn Provantage plow
- Always plow in low gear to keep RPMs up to keep battery charged.
- Always connect my ATV to a CTEK battery conditioner when done plowing to top off battery between charges.
You didn't state what gear you are plowing in. This makes a huge difference. High gear simply won't keep up with the winch usage (even without the lights) because you never really get the RPMs up when plowing.
You also mentioned a battery charger, but is it a trickle charger that you keep connected while the bike isn't in use? That also makes a difference. You want to keep the battery conditioned because it will lose power every day it is not used.
If you are plowing in low and trickle charge your battery when not in use, there is likely a problem with your battery or stator. Everything works fine for me, so the dealer is not correct if they say that is normal.