Servo Assembly
- Disconnect ball chain from throttle linkage (if equipped). Separate 8-way connector at amplifier, then connect an ohmmeter between the Orange/Yellow hash wire and Gray/Black hash wire at the connector. A resistance of 40-125 ohms should be obtained.
- Connect ohmmeter between Orange/Yellow hash wire and White/Pink hash wire at connector. A resistance of approximately 60-190 ohms should be obtained on Vans, and 60-90 on all other models. Reconnect the ball chain to carburetor. Start the engine with the servo-to-amplifier connector disconnected. Verify that engine vacuum exceeds 2.5 in. Hg.
- Connect Orange/Yellow hash wire of servo to battery positive terminal. Connect White/Pink hash wire to ground, and then momentarily touch Gray/Black hash wire of servo to ground. Servo throttle actuator should tighten bead chain and open throttle.
- Throttle should hold in that position or slowly release tension on chain. When White/Pink hash wire is removed from ground, servo should release bead chain tension immediately. If servo fails any of the preceding tests, replace the servo.
- If Orange/Yellow hash wire is shorted to either White/Pink hash wire or Gray/Black hash wire, it may be necessary to replace amplifier. Before proceeding to amplifier test, plug in the 8-way connector at Amplifier.