Starter Resistance Test

Before starting any tests, ensure that battery is fully charged and that all connections are good.
1. Disconnect positive battery cable and connect 0---300 scale ammeter between disconnected lead and battery terminal post.
2. Connect a voltmeter, graduated in tenths, between positive post on battery and starter relay terminal on starter solenoid.
3. Crank engine while observing reading on voltmeter and ammeter. A voltage reading exceeding .3 volts indicates high resistance caused by loose circuit connections, a faulty cable, burned starter relay or solenoid switch contacts. A high current combined with slow cranking speed indicates need for starter repair.
4. Reconnect positive battery lead to battery.