Component Tests

Ignition Switch Continuity Test

NOTE: For an engine-won't-crank condition with an automatic transmission (7003), determine if the condition exists with the shift control selector level in both PARK and NEUTRAL positions before performing the ignition switch continuity tests. If the no-crank condition occurs in one shift lever position but not the other, a more probable cause is the neutral start switch located in the transmission.

Disconnect ignition key warning switch terminal and wire from the ignition switch (11572). Test the continuity of the ignition switch as described in the following illustrations. Connect a self-powered test lamp or ohmmeter between the blade terminals indicated on the chart. No continuity between any blade and chassis ground should exist in any ignition switch position except the proof Circuit 41 (BK/LB) (Pin P1) and Circuit 512 (T/LG) (Pin P2) in the START position only.

Ignition Switch, F-Series and Bronco






Blade-Type Connector Ignition Switch Continuity Test, F-Super Duty Motorhome

Ignition Switch Mechanical Test

NOTE: Accessories that fail to operate with the key in RUN, or that remain on when the key is turned off, may be the result of a misadjusted ignition switch rather than a malfunctioning ignition switch. Refer to Ignition Switch in the Adjustments portion of this section.

NOTE: Do not apply lubricant to the inside of the ignition switch.

Test the steering column ignition system mechanical operation by rotating the ignition switch lock cylinder (11582) through all positions of the ignition switch. The movement should feel smooth with no sticking or binding. The ignition system should return from the START position back to the ON position without assistance (spring return). If sticking or binding is encountered, check for the following:

• burrs on the ignition switch lock cylinder
• binding ignition switch lock cylinder
• shroud rubbing against ignition switch lock cylinder
• burrs or foreign material around the rack-and-pinion actuator in the housing of the ignition switch lock cylinder
• insufficient lube on actuator
• binding ignition switch

Multi-Function Switch Continuity Test

Refer to the diagnostic charts to resolve concerns with the turn signal and windshield wiper switch.

MULTI-FUNCTION SWITCH CONTINUITY TEST, F-SERIES, BRONCO

To Test	Connect Self-Powered Test Light or Ohmmeter to Terminals	Move Switch to These Positions	A Good Switch Will Indicate
Flash-to-Pass	196 (DB/O) and 12 (LG/BK) 15 (R/Y) and 13 (R/BK)	Pull and hold lever stalk toward steering wheel	Closed circuit
Dimmer HI Beam	15 (R/Y) and 12 (LG/BK)	Lever stalk away from steering wheel	Closed circuit
Dimmer LO Beam	15 (R/Y) and 13 (R/BK)	Lever stalk in detent closest to steering wheel	Closed circuit
Turn Switch Circuit	44 (LB) and 9 (LG/O) 44 (LB) and 3 (LG/W)	Turn switch to TURN LEFT and hazard switch to OFF	Closed circuit
Turn Switch Circuit	44 (LB) and 5 (O/LB) 44 (LB) and 2 (W/LB)	Turn switch to TURN RIGHT and hazard switch to OFF	Closed circuit
Hazard Switch	385 (W/R) and 2 (W/LB), 5 (O/LB), 3 (LG/W), 9 (LG/O)	Hazard switch on (button depressed), then released to FULL OUT position)	Closed circuit
Stoplamp Feed-Through Circuit	511 (LG) and 9 (LG/O) 511 (LG) and 5 (O/LB)	Turn switch to center (no turn) and hazard switch to OFF	Closed circuit
Washer Switch Circuit	590 (DB/W) and 993 (BR/W)	With wiper switch off, push washer switch in; release washer switch	Closed circuit 103.3k ohm
Wiper Switch Circuit	589 (O) and 993 (BR/W)	Off Int Lo Hi	47.6k ohm ± 5% 11.33k ohm ± 5% 4.08k ohm ± 5% Closed circuit
Interval Time Adjust	590 (DB/W) and 993 (BR/W)	Int and Off	Rotate control toward OFF; ohmmeter will show smoothly increasing resistance from 3.3k ohm min. to 103.3k ohm max. (± 10%)
		Lo and Hi	3.3k ohm 10%

MULTI-FUNCTION SWITCH CONTINUITY TEST, F-SUPER DUTY MOTORHOME

To Test	Connect Self-Powered Test Light or Ohmmeter to Terminals	Move Switch to These Positions	A Good Switch Will Indicate
Flash-to-Pass Circuit	196 (DB/O) and 12 (LG/BK)	Pull and hold lever stalk toward steering wheel	Closed circuit
Dimmer HI Beam Circuit	12 (LG/BK) and 15 (R/Y)	Lever stalk in detent away from steering wheel	Closed circuit
Dimmer LO Beam Circuit	15 (R/Y) and 13 (R/BK)	Lever stalk in detent toward steering wheel	Closed circuit
Turn Switch Circuit	44 (LB) and 9 (LG/O), 3 (LG/W)	Hazard switch to normal (OFF) and turn switch to TURN LEFT	Closed circuit
Turn Switch Circuit	44 (LB) and 5 (O/LB), 2 (LG/O)	Hazard switch to normal (OFF) and turn switch to TURN RIGHT	Closed circuit
Hazard Switch	44 (R/LG) and 2 (W/LB), 3 (LG/W), 5 (O/LB), 9 (LG/O)	Hazard switch to hazard (ON) (button pushed in and then released to fully extended position)	Closed circuit
Stoplamp Feed-Through Circuit	511 (LG) and 5 (O/LB), 9 (LG/O)	Hazard switch to normal (OFF) and turn switch to neutral	Closed circuit
Washer Switch Circuit	590 (DB/W) and 993 (BR/W)	With wiper switch off, push washer switch in; release washer switch	Closed circuit 103.3k ohm
Wiper Switch Circuit	589 (O) and 993 (BR/W)	Off Int Lo Hi	47.6k ohm ± 5% 11.33k ohm ± 5% 4.08k ohm ± 5% Closed circuit
Interval Time Adjust	590 (DB/W) and 993 (BR/W)	Int and Off	Rotate control toward OFF; ohmmeter will show smoothly increasing resistance from 3.3k ohm min. to 103.3k ohm max. (± 10%)
		Lo and Hi	3.3k ohm ± 10%