There is no relay. What you need to do is check the ground at the headlights first. If that is good, trace power from the fuse thru the diagram at link below. Also make sure the headlight switch conne tor has ground and that the appropriate wire from the headlight switch supplies ground to the lighting module on the requisite pin corresponding to the headlight setting. Basically, pin 10 should be getting ground from the switch on the red/yellow wire when the headlight switch is on. You can test the downstrean circuitry by using a jumper from a ground point to the red/yellow wire terminal. If the lights come on, you know the switch is not supplying ground. What you have is a wiring issue.
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=59307
SOURCE: Computer Module
hello jaronricky , the Powertrain Control Module (PCM) is located right next to the power brake booster . 2000 crown vic
SOURCE: 1998 ford crown victoria fuse box diagram
it should be in your owner manual. if not, I can look up something for you but can't post illustrations to this site.
SOURCE: Headlights turn off while driving
Headlight module under the dash. It is the size of a box of crackers, not a small part.
SOURCE: Battery wont charge in my 1997 ford crown victoria
In the 1995 and later Crown Victoria's, there is a fuse in the fuseblock that controls the alternator's charging of the battery. If that fuse is blown, your car will drain the battery and cut off as you stated.
Check the fuse block under the hood and the one located on the left driver side above the hood pull.
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