2000 F150 Dash Electrical Issue Help
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3rd Gear
Joined: Jun 2023
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2000 F150 Dash Electrical Issue Help
Removed the dash on my 2000 F150 when I replaced the heater core. Have a couple of issues that I assume are related. I’ve taken it back apart and cleaned and reconnected wiring twice, so don’t think that’s it.
Symptoms: Auto headlights not functional(but manual works fine), cruise control not functional, speedometer remains at constant 33ish mph when truck is on regardless of speed(or even whether it’s in gear). Tach and odometer appear to be functioning properly. No problem lights/codes.
None of these are critical to me, but would be nice if they worked right. Any suggestions? As noted, seems not to be the connections behind the instrument cluster, which was, of course, my first assumption.
Thanks.
Jbo
Symptoms: Auto headlights not functional(but manual works fine), cruise control not functional, speedometer remains at constant 33ish mph when truck is on regardless of speed(or even whether it’s in gear). Tach and odometer appear to be functioning properly. No problem lights/codes.
None of these are critical to me, but would be nice if they worked right. Any suggestions? As noted, seems not to be the connections behind the instrument cluster, which was, of course, my first assumption.
Thanks.
Jbo
Fleet Mechanic
Joined: Jul 2019
Posts: 1,312
Likes: 311
Sounds like the sunload sensor under that dash lid on the passenger side got disconnected somehow.
Speedometer…lost a ground to the circuit? It seems to be getting current and I doubt you swapped wires around to make the needle stick.
Cruise may have gotten disconnected in the clockspring.
Either way, tough to tell without being a fly on the wall while you were reinstalling everything.
Speedometer…lost a ground to the circuit? It seems to be getting current and I doubt you swapped wires around to make the needle stick.
Cruise may have gotten disconnected in the clockspring.
Either way, tough to tell without being a fly on the wall while you were reinstalling everything.
Fleet Mechanic
Joined: Jan 2023
Posts: 1,296
Likes: 439
The problems do not have an obvious connection (common fuse, module etc.). The cruise control uses the VSS (speed) signal from the PCM. It also uses the speed servo control module. The autolamps are controlled by the autolamp module.
Here are the wiring diagrams for a 2000 F150:
https://charm.li/Ford%20Truck/2000/F...d%20Diagnosis/
Of course, check the fuses for the two modules. Then pick a problem and see if you can find wiring or a connector you had to disturb when replacing the heater core. Ground connections are important so look at the wiring for the grounds.
Here are the wiring diagrams for a 2000 F150:
https://charm.li/Ford%20Truck/2000/F...d%20Diagnosis/
Of course, check the fuses for the two modules. Then pick a problem and see if you can find wiring or a connector you had to disturb when replacing the heater core. Ground connections are important so look at the wiring for the grounds.
Hotshot
Joined: Jul 2020
Posts: 10,359
Likes: 2,595
From: Near Salt Lake City
Check all the connectors near the left kick panel
Check the ones on the right side again
Under the hood, check all the connectors by the processor and verify the wires coming from the starter relay are correct
Check the ones on the right side again
Under the hood, check all the connectors by the processor and verify the wires coming from the starter relay are correct
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kennyrandolph
1987 - 1996 F150 & Larger F-Series Trucks
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Sep 1, 2009 09:23 PM
