Motor Ground Circuit

Motor-Ground Circuit

A slow cranking condition can be caused by resistance in the ground or return portion of the cranking circuit. Check the voltage drop in the ground circuit as follows:







1. Connect the 73 Digital Multimeter positive lead to the starter motor housing (the connection must be clean and free of rust or grease). Connect the negative lead to the negative (-) battery pin.
2. Engage the remote starter switch and crank the engine. Read and record the voltage reading. The reading should be 0.2 volts or less.
3. If the voltage drop is more than 0.2 volts, clean the negative cable connections at the battery, the body ground connections and the starter ground connection. Retest.
4. If the voltage drop is greater than 0.2 volts, install a new cable. If the voltage reading is less than 0.2 volts and the engine still cranks slowly, install a new starter motor.