HAIER REFRIG IN A CAMPER

Interesting! I'm going to assume that this is a 110V unit running on an alternate power supply rather than regular AC. First: test the circuit with at least a 100 watt light bulb for a few minutes. If that looks okay (bulb at full brightness, not flickering), let's go on. What I also don't know is what 'overloads' you're speaking about. If it is the compressor (there is a light clicking sound periodically in or near the black compressor unit), the problem could be that it is overheating because something is blocking the airflow around the coils like an ant nest or debris. You've got to go in and clean them. Unplug unit, remove the contents and glass shelves, lay the unit on its side so you can see what's what in the back. Remove anything that looks like the manufacturer didn't put it in there. Look up into the area where the tubes go into the back panel area, too. Do not clean with water! If the unit is more than 5 years old, it probably should be scrapped. Note that older units have R-12 refrigerant which should be handled only by a qualified tech or recycler.