Go to SEARS and look at their CRAFTSMAN CLAMP ON AC/DC ampmeter. Cost around $60..
Looks like this
They also make a AC model only that looks the same so be sure to get the one that measures AC and DC up to 400AMPS...
These are great for measuring DC CURRENT at the +12VDC battery cable.
Top measure AC AMPS you will have to clamp around the BLACK CABLE coming in from Shore Power. The best place to do this is at the AC POWER DISTRIBUTION PANEL where you remove the front panel and clamp around the single BLACK wire coming from the main circuit breaker.
Roy Ken
