Article 1219 - Turn Signal and Emergency Switch Diagnostic Procedure

TSB #80 - November 24, 1967
(All 1967 & 1968 Vehicles)

Turn signal switch or system problems have been encountered in the field during past model years. The purpose of this article is to assist technicians in quickly and accurately diagnosing the turn signal switch malfunction. Since all switches which are returned from the field are completely tested (electrically and mechanically) and a high percentage of non defective turn signal and emergency flasher switches are being returned, it is felt the need for proper diagnosis of switch and system problems should be emphasized.

To preclude unnecessary replacement of non-defective turn signal or emergency flasher switches due to. improper diagnosis, it is suggested that a new switch be substituted (without making complete installation) in the following manner:

• Disconnect the turn signal switch from the main loom connector at the base of the column following instructions outlined in the shop manual.
• Attach a diagnostic switch to the main loom connector and test the turn signal system by actuating the new switch.
NOTE: A set of good turn signal switches must be available for use as a diagnostic tool. The diagnostic turn signal switches should include those switches used to cover all 1967 Ford carlines, as advised by ICC #9418, plus the following four (4) additional switches which will allow service personnel to diagnose any 1968 carline with the highest degree of accuracy possible.

Part NumberUsage
C8ZZ-13341-AMustang (fixed and tilt)
C80Z-13341-AFord, Falcon, Fairlane(fixed and tilt)
C8SZ-13341-BThunderbird (fixed and tilt without speed control)
C8SZ-13341-CThunderbird (fixed and tilt with speed control)

• It is important the proper switch be used to diagnose the problem vehicle as differences exist between carlines and turn signal systems.
• If the system responds normally, the new switch should be installed. If it does not respond normally, the problem is not in the switch and further investigation of the system is required. Refer to the appropriate shop manual for diagnostic procedures.

Familiarity with the following Technical Service Bulletin articles will assist in properly diagnosing turn signal complaints on all model vehicles:

11871/25/66Malfunction of turn signal switches
293155/10/65Emergency warning flasher system operation
4542310/8/65Turn signal problem diagnosis
4922510/29/65Electrical feedback
9234810/21/66Intermittent operation of electrical components

It should be noted that intermittent operation of the accessories can occur with the ignition switch off and the emergency flasher switch partially depressed. This is a normal feature of switch circuitry and is not a valid reason for switch replacement.

Switches found to be non-defective will result in debits to the dealers, as stated in ICC#9418, dated July 12, 1967. In addition, any switch with cut leads will be debited as advised in Technical Service Bulletin No. 49, Article 924, dated November 4, 1966. Wires may be removed from the 1967 and prior model hard-shell connectors without damaging the connector by use of a simple tool described in Technical Service Bulletin, Article No. 77, dated December 7, 1964. The hardshell connector has been revised effective Job #1, 1968. A procedure to remove this connector is provided in a separate article of this TSB issue. (Article 1218)

NOTE: When replacing a defective turn signal switch, take care to remove the black rubber wire cover and re-install the cover on the new switch loom. The rubber cover is necessary to protect the wires from chafing and is essential for proper appearance.