Mine is under the bonnet also. the only issue I have had is with the battery temp monitor, we were out at Longreach at xmas and doing some slow 4x4 so the car had little air flow and the temp was 46 deg in the shade and under the bonnet was really bloody hot therefore it didn’t want to charge my aux batt as it was saying the temp was to hot so i had to pull the monitor from out the bonnet and run it to in front the radiator where it would give a cooler reading, great safety feature and surely would save a battery but it was either that or the food go off.

still a great unit and i would definitely buy one again and recommend them also and couldnt justfy paying the price for a redarc unit.