How to I check 4 prong 30 amp invertor plug with multi-meter?

There is no power going to the male plug from the inverter. The power comes from the generator. You can change the plug safely if you know which 3 wires to use and where each one goes. The danger is in getting the wires wrong in the new plug and destroying the generator and inverter.

Yikes!!! Okay maybe I'm best to call the electrician back and he can do it himself. I don't want to be ruining any generator or invertor. Thanks Chris

canfossi said:

Yikes!!! Okay maybe I'm best to call the electrician back and he can do it himself. I don't want to be ruining any generator or invertor. Thanks Chris

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.................That plug is probably a round , insert and twist to lock plug for 240 volts , if so , it has 2-120 volt connections , a neutral and a ground . Most 120 volt plugs are the conventional looking ones with 2 flat metal legs and the round leg which is the ground . , fordy

Make an adapter plug for the generator. Get a male 3 prong to fit the generator. Then using a short length of wire connect the male from the generator to a female 4 prong that matches the plug to the inverter. Plug the inverter to the generator using this adapter cable. If should be cheaper than calling the electrician back who is not wanting to work on the weekend. Also, nothing will have to be worked hot doing this.

I'd double check the instructions on the inverter. Two of the prongs will need 110, the other is a ground. Turn on the generator, test which two of the three on your generator are 110, and make sure, when you disconnect the four prong and replace with the three prong, that you get the correct wires respliced to the correct prongs.

"I" wouldn't attempt this with distractions around me... making a mistake makes smoke poof out of most appliances. Of course, your inverter might have a breaker preventing damage. Two hots and a ground, match em up, and you're golden.

How big is your battery bank? Unless it was monstrous, I'd probably just charge with 110... I believe (it's been a few years since I studied em) that unless you have a very large bank, that you might charge them too fast...

What brand of inverter? Zantrex?