Servo Assembly
- Disconnect ball chain from carburetor, if used. Separate 8-way connector at amplifier, then connect an ohmmeter between Orange/Yellow dashed wire and Gray/Black dashed wire at connector. A resistance of 40-125 ohms should be obtained.
- Connect ohmmeter between Orange/Yellow dashed wire and White/Pink dashed 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 engine with servo-to-amplifier connector disconnected. Verify that engine vacuum exceeds 2.5 in. Hg.
- Connect Orange/Yellow dashed wire of servo to battery positive terminal. Connect White/Pink dashed wire to ground, and then momentarily touch Gray/Black dashed wire of servo to ground. Servo throttle actuator should tighten bead chain or actuator cable and open throttle.
- Throttle should hold in that position or slowly release tension. When White/Pink dashed wire is removed from ground, servo should release tension immediately. If servo fails any of preceding tests, replace servo.
CAUTION:
If Orange/Yellow dashed wire is shorted to either White/Pink dashed wire or Gray/Black dashed wire, it may be necessary to replace amplifier.