I have a fluke i1010 amp clamp for ac/dc current measurements on things over 60 amps and I use a PDI CA-60 for up to 60 amps. Either of these would work with the Mooshimeter. The Fluke would have to be adapted but the PDI plugs right in. Unless you want to check amp output driving down the road which can be done but you can get cheap amp clamp multimeter combo for just testing alt amp output while under the hood.