The first solenoid I replaced was from Trident bought at west marine ane it got quite warm 170F with ambient temp in 60's. The replacement I tried is from Advanced Fuel Components model 151. The temp reading after it was energized for 1 hour is 108F. Big difference, I measured voltage at batteries and at solenoid before wiring and the voltage drop was 0.18V. Tom Evans SV Tappan Zee Alameda Ca