I just replaced my trolling motor and need help, the plug has 4 prongs but only 3 wires, the old troller was a 12/24 the new one is straight 24. on the plug there are 2 red wires and 1 black. the new troller has only 2 wires red and black. i know this is simple but i don't have any power when i plug it in. any help would be great. BTW i went from a motorguide to a motorguide if this helps

thanks alot
harry