I'm going through the steps to convert a hot tub to 240v. The breaker tripped immediately when it was flipped on. I used a volt meter to ohm out the wires to check for a short. It appears the neutral lug is somehow connected to the line one lug. When I have the wires under the lugs and tightened, it shows I have continuity when I touch the meter to the line 1 lug and neutral lug. Ideas? There is no short between the wires when I take them loose and test them, only when they are under the lugs.