I recently replaced the voltage regulator on my 1983 W150 Dodge pickup. I have the old VR and am wondering if anyone knows what could be learned with a multimeter. There are two contacts and the metallic case. I can measure the resistance between any of the two contacts. Does this tell me anything useful? The reason for replacing the VR is the battery wasn't charging and the alternator tested OK. Wiring seems OK, but it is getting old. No shorts detected, but could be intermittent. The battery seems to be charging, but I'm going to wait till it warms up a bit to continue testing. The truck is outside and it's below zero.