Voltage Drop Test

NOTE: Make all voltmeter connections at component terminal rather than at cable or wire end.

Disconnect inertia fuel shutoff switch to disable fuel system. Connect remote starter switch between starter solenoid terminal "S" and positive battery post.
Connect positive voltmeter lead to positive battery post, and negative lead to solenoid terminal "M". See Fig 1 .

Fig 1: Testing Voltage Drop
Courtesy of FORD MOTOR CO.
Engage remote starter switch. Voltmeter should indicate .5 volt or less. If voltmeter indicates more than .5 volt, move negative voltmeter lead to solenoid terminal "B". If voltmeter indicates .5 volt or less, go to STARTER GROUND CIRCUIT TEST.
Engage remote starter switch. If voltmeter indicates less than .5 volt, solenoid connections or contacts are bad. Clean solenoid terminals "B", "S" and "M". Repeat steps 1) through 4). If voltmeter still indicates more than .5 volt at terminal "M" and less than .5 volt at terminal "B", solenoid contacts are bad. Remove and repair or replace solenoid.
If voltmeter indicates more than .5 volt at terminal "B", clean cables and connections at solenoid. If voltmeter still indicates more than .5 volt at terminal "B", replace battery cable.
To locate excessive voltage drop, move voltmeter negative lead toward battery, and check each connection point. When high voltmeter reading disappears, problem is between last connection point and previous connection point.