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Troubleshooting A Brake Lite Relay Kit Installation On A 2016 Ford F-150  

Updated 06/27/2024 | Published 06/19/2024

Question:

I installed the brake relay on a 2016 F150 Lariat 4x4 and now the neutral safety switch does not work. What am I missing? I followed the on line video from etrailer.

0

Expert Reply:

Hey Karl,

The wiring for the neutral safety switch is in the same area so it's possible you spliced into the wrong wire. Is your F-150 a push start or keyed ignition?

expert reply by:
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Kevin C
Normally closed wiring diagram
Normally closed wiring diagram
(click to enlarge)
Karl profile picture

Karl

6/27/2024

Push start. I meant to say park safety switch not neutral safety switch. Thanks for the response.

Kevin C. profile picture
Etrailer Expert

Kevin C.

6/27/2024

@Karl When you installed the brake lite relay # RM-88400 did you follow the normally open or normally closed wiring diagram? Push-start models will need to follow the normally closed diagram and might need to add in a diode # RM-790 to the brown running light wire from your diode wiring kit in order to properly operate. I've attached the diagram above.
Karl profile picture

Karl

6/27/2024

@KevinC Bingo! Normally closed. Problem resolved. Thanks for the assistance. Karl

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