How To Test A Relay Fuse With Multimeter. The indication of the multimeter should basically match the coil resistance of the relay. If you wish to test a fuse still located in a circuit.
The multimeter acts as if it was a cord in your circuit. A relay can be checked with a jump cable a voltimeter an ohmimeter or a test light. We will start with the coil of the relay.
There is no polarity so you can use any lead for either fuse cap.
With the relay removed from the fuse box the multimeter set to measure DC voltage and the switch in the cab activated first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in. Whilst the leads are firmly connected to the fuse look at the reading displayed on the multimeter. The purpose of testing a relay is to find whether it is good or bad. Heres how to test a relay with a multimeter for pins 30 and 87.
