Question about Cars & Trucks
My Auto Headlights do not work. I check the Fuse 29 and it was not blown. I can manual turn the lights on. What other checks should I be doing?
There is a relay on the fuse box under the hood and there is a GEM that controls the entire system. The GEM is under the center of the dash and it is not cheap.
Posted on Feb 09, 2014
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Posted on Jan 02, 2017
SOURCE: electrical problem
I finally broke down and took my truck to the dealer. It took them two tries, but they finally figured it out. It turned out to be the wiring harnes for the shift lever. When it exits the steering column, it was being chafed, and eventually wore through a wire and was intermittently shorting. It would blow a fuse (don't remember which one - I think it was on the bottom row, third in from the right. 20A). It stopped the alternator from charging too. They replaced the shifter harness and the problem went away. I did get a ticket while my speedo was inop however.
Posted on Oct 04, 2008
Facing fuse box, left hand side, bottom fuse
Posted on Jan 21, 2009
It is a possible option that the relays for the Stop / Turn are having an issue or the fuse in the Engine Mini panel is blown ( page 142 of the 1997 owners manual )
On the 1997/98 MY this is in the aux relay box in between the Engine Compartment fuse panel and the engine mini fuse panel.
The output of the MFS ( Multifunction switch ) triggers the relays, to use the trailer tow fuse to operate the trailer lamps. The fuse to supply power to the Normally Open contacts on the trailer relays should be hot at all times. You can verify this with the diagram below by metering from pin #3 to pin # 2 [ground for coil] or to another known ground.
These are 1/2 size Ford ISO relays, and can be jumpered to make testing easier ( and with this diagram you can bench test them with a meter to check resistance over the Normally Open contacts, when applying power and ground to the coil ).
I am not 100% sure on the 97/98 MY F-150 about the location of this connector, but the 99-03 have all the wires to the rear of the truck via a connector along the driver's side frame rail, that you can check for ( easiest with the spare lowered )
Start with the Fuse in the Engine Mini panel, to see if the 20A fuse is good and work back towards the trailer tow adapter via the relays. I am going with the obvious blown fuse for the Stop/Turn lamps for the trailer.
Posted on Dec 14, 2009
what is the battery voltage with no headlights on and car running with a multimeter and your light on the dash on?
what is the voltage at battery with car running and headlights on with a multimeter?
It sounds like it is overcharging,
Posted on Jan 11, 2010
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