Ken K
I'm Awesome
Yea, plows suck the juice fast, I have two alternators and two batteries in mine and its still struggles at times when I have the radio blasting and headlights on plowing short runs when I need to change plow direction often.
To RichLo, Retired ASE Master Tech with some ideas. Check the output from each alternator to verify proper operation. Running two batteries is fine with good connections, good batteries, but more so remember the alternators run all accessories once started as the batteries only start the engine. Voltage drop while running your snow plow up or down is the quickest most accurate check the integrity of connections and relays. On high current circuits, expect to see 0.50 volts lost across a connection or relay contacts, same with B+ from alternator to battery(s). With current flowing (Circuit on), use your DMM across any single path the current takes in a series circuit. Red led / black led, who cares, same reading, just with a (-) symbol on DMM. Test each wire, across each connection, across each relay and same with ground. You will find the loss of voltage that causes you systems issue. More often than not, I found bad grounds. I clean, add more / new, use dielectric grease and star washer and make sure the size of the wire, matches the amount of current for the length of wire you have. Best of luck.