Initial Inspection and Diagnostic Overview

Disconnect does not imply removal. A disconnected part should not be reconnected until specific reconnect instruction is given.
A voltmeter, an ohmmeter and a jumper wire will be needed the following testing procedures.
Attach positive lead to circuit voltage and negative lead to specified ground. If a digital voltmeter is used on circuits 608 and 609 with the monitor disconnected, the correct voltage will not be indicated.
All resistance checks must be made with negative lead of ohmmeter at vehicle ground, not battery ground, unless specifically directed otherwise. Three places are recommended; metal bracket of starter relay, ignition lock cylinder on the steering column or the ground wire from harness under righthand side of instrument panel.