Inoperative Cruise Control

Check all items indicated under Erratic Cruise Performance. Unplug terminal connector at regulator, then reconnect placing White wire into hold terminal and leave Brown/White wire disconnected. Proceed with testing as follows:

1. Turn ignition switch to "ON" position, depress engage switch halfway and hold in that position. A "thunk" should be heard indicating the regulator is engaging. If no "thunk" is heard check fuse, and brake switch adjustment. Check that regulator circuit between hold terminal and ground reads 4-6 ohms. Check engagement switch. See ELECTRICAL SYSTEM . Check white wire at regulator for battery voltage. If all conditions check good and no "thunk" is heard, regulator requires replacement.
2. With vehicle in "Park" position, start engine and depress engage switch halfway. If engine speed does not increase, disconnect orifice tube hose at the regulator and plug hose. If engine accelerates, check voltage at Brown/White stripped wire. If 12 volts are indicated, replace the regulator. If engine speed still does not increase, a vacuum leak or restriction is indicated. Disconnect large hose connected to regulator and check for vacuum at regulator fitting.
   NOTE: Engage switch should remain depressed to halfway position.
3. If no vacuum is found at regulator fitting, remove engine manifold vacuum supply hose at regulator and check at hose for vacuum. If vacuum is present at hose, regulator requires replacement. If vacuum is not present at hose, check the vacuum supply hose and vacuum fitting at engine.
4. If vacuum is found at regulator fitting, reinstall large hose at regulator. Remove hose at servo unit and check hose for vacuum while engage switch is depressed halfway. If vacuum is present, servo unit requires replacement. If no vacuum is present, check hoses and fittings to regulator, then check brake release valve and hose.