JUST PURCHESED A VANTAGE WITH A SNAP ON LOW AMPS PROBE AND A KV MOD MY QUESTION IS TO TEST FOR AMPS ON SAY A FUEL PUMP I HOOK UP MY AMPS CLAMP AND GET NO READING DO I NEED A LEAD FOR THE AMPS JACK ON THE VANTAGE OR AM I MISSING SOMETHING THANKS FOR YOUR INPUT ... Login to read more.