When I turn the key on in my 99 Expedition Guages go to maximum
When I turn the key on in my 99 Expedition, all of the gauges go to top including the speedometer. They then go to normal. Then when I turn to start everything goes off electrically including dome lights, all accessories etc. It won't turn over, just clicks and then the theft light comes on solid. This is all new since the heater core was replaced. Any ideas? Checked all wiring harnesses twice. All appear to be hooked up correctly.
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Re: When I turn the key on in my 99 Expedition Guages go...
Probably when heater core replaced instrument cluster was damaged. check for broken wires or loose connections. on newer vehicles sometimes if you disconnect the instrument cluster you have to reprogram it with a scan tool for the car to recognize it.
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Impossible to tell without knowing what fuse number is blowing, along with some basic electrical troubleshooting.
Common suspects include:
altered factory stereo
Aftermarket alarm system
defective instrument lamp
defective instrument panel
Take the instrument cluster out of the truck. Turn it face down and remove the back cover. It is a big computer panel. Right behind the odometer screen you will see nine little wires coming up and saughtered to the board. One of the wires will have a crack in the saughter. It needs to be redone to make a good connection. I had this problem for a long time and it took no time to fix. Hope this helps!
The two gauges are on separate circuits, so one should not affect the other. The gauges are grounded thru their sending units. I would suspect a short in the wiring somewhere between the instrument panel and the engine.
Find your evaporator canister which will be toward the firewall. The low port is hard to see. You will need to buy yourself a re-fill kit which comes with the freon and gauge. Warm the engine and turn air cond. on. Attach the hose to your low port. Attach the can to the hose and turn the needle to pierce the top of the can. Be sure to turn the valve needle slowly to release the freon into the system. If the can starts to frost over, wrap a warm cloth around can to get the freon to flow easier. The kit will come with a gauge which will tell you if the system is already overcharged with problems or if the system needs freon. The one I have has yellow, blue, green, and red. The yellow is low, blue is good but the system could still use more depending on the psi, green is overcharged, and red is over charged with system problems, or other system problem.