Motor Ground Circuit
WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Make all multi-meter connections at the component terminal rather than the cable or wiring terminal.
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:
- Disconnect the ignition coil connector from the ignition coil.
- Connect a remote starter switch between the starter solenoid S-terminal and the battery positive (+) terminal.
- Connect the positive (+) lead of a 73III Automotive Meter to the starter motor housing. The connection must be clean and free of rust or grease. Connect the negative (-) lead to the negative (-) battery terminal.
- Engage the remote starter switch and read the voltage. The reading should be 0.5 volt or less.
- If the voltage drop is greater than 0.5 volt, clean the negative (-) battery cable connections at the battery and chassis. Also, clean the engine ground cable connection at the cable mounting bracket. If the voltage drop is still excessive, repair or install a new battery ground cable.