2006 Ford F 150 when the engine is running if I turn the headlamps on the engine cuts off

10

Asked by Dec 20, 2015 at 07:18 PM about the 2006 Ford F-150 XLT SuperCab Styleside

Question type: Maintenance & Repair

Ford f150 2006 model when the engine is running if I turn the headlamps on the engine will cut off what could be the problem

4 Answers

10

I think it could be the ballast but I don't know where to locate it could you help me get room

1 of 1 people found this helpful.
66,215

Sounds like a dying alternator. Once the engine is running it's the alternator that runs the ignition system, as well as the rest of the electronics on your truck. Theoretically the ignition system should run off the battery if the alternator quits. That's what the reserve capacity rating on your battery is. But, you never know. Have the alternator tested at your local auto parts store. Most will do it for free and they don't have to remove the alternator for the test. HTH. -Jim

1 of 1 people found this helpful.
6,465

If Jim is right the alternator is an easy fix and would kill the vehicle. The lighting system per ford's diagram isn't tied into anything related to the ignition system, however if you have an aftermarket alarm on the truck that is tied into the lights it could be an alternate cause. Those light switches can't handle any load that is added to them for very long.

1 of 1 people found this helpful.
18,340

First, do not begin throwing parts at the problem. What is happening is when power is applied to the headlights, the signal to the PCM, BCM, etc. is being scrambled. The cause could be as simple as a defective headlight switch, or a bad ground somewhere in the lighting circuit. It could also indicate a problem with the ignition switch (not the ignition cylinder). If you know your way around electricity, you can bypass the headlight switch by unplugging the connection to the switch and using a jumper to turn on the lights.

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