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Starter Ground Circuit Test

NOTE: Make all DVOM connections at component terminal rather than at cable or wire end.
  1. Disconnect inertia fuel shutoff switch to disable fuel system. Connect remote starter switch between starter solenoid terminal "S" (Gray wire) and positive battery post. See Fig 1. Using a digital DVOM set at lowest voltage scale, connect positive DVOM lead to starter housing, and negative lead to negative battery post.
  2. Engage remote starter switch while observing DVOM. The DVOM should indicate .5 volt or less. If DVOM indicates more than .5 volt, clean negative cable connections at battery and chassis. Also clean engine ground cable connections at front cover and engine mount bracket. If voltage drop is still excessive, repair or replace negative battery cable and/or engine ground cable as necessary. Repeat starter circuit test after repair to ensure problem has been corrected. If battery and cables test okay and starter motor still cranks slowly or not at all, replace starter motor. See STARTER MOTOR  under REMOVAL & INSTALLATION.
    Fig 1: Testing Ground Circuit
    G98B12279Courtesy of FORD MOTOR CO.