A/T - E4OD Proper Stoplamp Circuit Splicing

9209ford02

Article No.
92-1A-7

01/26/92


TRANSMISSION - E40D AUTOMATIC - SPLICING INTO STOP LAMP CIRCUITRY


LIGHT TRUCK: 1989 and after BRONCO, ECONOLINE, F SUPER DUTY, F-150-350 SERIES


ISSUE: Qualified Vehicle Modifier (QVM) Bulletin Number 10 emphasized the importance of proper splicing into the stop lamp electrical circuit. The bulletin is printed here as an added aid to the service technician.

ACTION: Refer to the following pages.


SPLICING INTO THE STOP LAMP ELECTRICAL CIRCUIT

This bulletin emphasizes the importance of QVM Bulletin # 8, issued October 13, 1989, which cautions builders concerning altering or connecting to stop lamp circuits. The stop lamp switch and related wiring not only control the stop lamps, but also provide the brake on/off input to the electronic modules of the EEC, E40D, speed control, and anti-lock brake systems. Splicing into a location that interrupts the signals to these modules can interfere with their proper functioning, including:

1. Affecting EFI engine idle speed quality


2. Preventing the E40D torque converter clutch from applying at throttle openings less than half throttle

3. Deactivating anti-lock brake system operation

4. Preventing the speed control from disengaging upon braking

Figure 1:

Figure 2:

Figure 3:

Figures 1, 2, and 3 of this bulletin illustrate acceptable locations to splice into the stop lamp circuits of Econoline and F-Series vehicles.

Note that when stop lamps are installed in addition to the OEM stop lamps, the additional load must not exceed 6 amps (3 bulbs), yielding a total circuit draw not exceeding 10.4 amps (5 bulbs). Loads exceeding 10.4 amps can damage the stop lamp and/or turn signal switch.

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 203000, 203200, 206000, 301000, 504000