No headlights, power door locks or key-less entry

Tiny
THORN616
  • MEMBER
  • 2002 FORD F-250
  • 7.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 242,000 MILES
I have recently found a split ground wire from the alternator and the power cable to the starter rubbing through on the chassis. Both issues have been fixed. What I have remaining are the power door locks not working, the key-less entry not working, and the headlights do not work when toggled. I have running lights and high beams but when I switch to headlights, there is nothing. The attached picture shows the position in which the headlights do not turn on. High beams, flash to pass, and fog lights all work.
Saturday, June 13th, 2020 AT 7:34 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning again.

I attached a wiring diagram for you to view.

Do you have a test light or voltmeter for some testing?

https://www.2carpros.com/articles/how-to-check-wiring

We need to do testing at the relay.

Roy
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Saturday, June 13th, 2020 AT 7:59 AM
Tiny
THORN616
  • MEMBER
  • 30 POSTS
I have a multi-meter. And the power wire on the starter was rubbed through arcing on the chassis, not the alternator power wire.
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Saturday, June 13th, 2020 AT 8:20 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Hello again.

I attached a wire diagram for you to view.I attached the connector diagram for you.

You need to verify power from the switch to the headlights.

Check the red/yellow wire for power out of the switch. That is for the low beams.

Roy
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Saturday, June 13th, 2020 AT 8:26 AM
Tiny
THORN616
  • MEMBER
  • 30 POSTS
Well as my luck would have it, my multi meter quit working before I got to check the wiring at the switch. I was able to check at the headlight, there was definitely power per the multi meter with the running lights on, but when I would switch to turn on the headlights there was no power at the light.
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Saturday, June 13th, 2020 AT 9:29 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, so you have DRL system.

I attached the wiring diagram for the DRL.

Roy
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Saturday, June 13th, 2020 AT 9:40 AM

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