Originally Posted by butch413
wmtire, I don't remember what color the wires are but I will find out tonight, I very well may have them in reverse order. So the 40amp fuses are for if it was hooked up backwards? It is still plugged into the same 30 amp outlet and the exten. cord is a camper 30 amp cord. I will look tonight and make sure the red is on poss and the white is on neg. Thank you so much
Yes, the reverse polarity fuses are there to protect the converter.
What the converter does it to take 120 volt AC shore power, and convert it to 12 volt DC power. It then powers the things in your RV that work off of 12 volt DC power (lights, furnace, fans, lp detectors, fridge on propane, thermostats, water pump, etc). The converters other function is to recharge your battery. When you are connected to a form of 120 volt AC shore power, then all of the aforementioned will run off of the converter and not the battery.
When you are not on shore power, then these things run off of the battery direct. This allows you to camp at places where 120 volt AC power may not be available...as in boondocking or dry camping.
If you have the battery hooked up backwards, then it blows the fuses to the converter, and thus the converter cannot provide power to the 12 volt stuff......nor recharge the battery.
Your air conditioner, microwave, and all the 120 volt outlets all operate off of 120 volt AC power only. However, the thermostat that controls the air conditioner works off of 12 volt power.....so if you have no 12 volt power, then the air conditioner cannot function.......and neither can the furnace, as it's 12 volt only
Does your microwave and any of the outlets in the RV currently work, so we can verify that your incoming 120 volt AC power is working thru the extension cord?
Mark Polk has some good articles that may help you understand your RV's electrical systems.