OEM Ford remote starter quit working.

Could be a bad starter, bad fuse for starter, or even bad relay for starter

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Yellow with White marking on the wire from the guage to the selector switch. http://ww2.justanswer.com/uploads/sdcrowder/2011-06-10_002304_86_f150_fuel_tank_selsecter_switch_wiring_diagram.gif

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if they work when not driving ,then its not a fuse.
what is gages,my englich is not so good.

Have a load test done on the battery as it indicates a bad cell. Replace if necessary.

Do you know if they also replaced the sending unit in the tank ?
It could also be a problem with the gauge on the dash.

The power goes from the headlight switch thru the dimmer switch for the dash then to the cluster. You would check for voltage at those three points.

first thing i would do is compresion test if good go thru fuses and relay check all grounds

Do not install the OEM starter - it only works from about 80 feet away and is quite problematic. I just purchased a new V6-AWD with the push button start and the dealer is taking the OEM start out as we speak and taking it for an after market starter.

If you decide to do it yourself (you'll need to be quite mechanically inclined for this install), check youtube as the poster above has suggested - but again I highly suggest you consider an aftermarket starter and save the money that I didn't.

I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer...
rest is up to u.. U get free manuals

it sounds like who ever hooked up the remote starter may have crossed wires I would recommend takeing it back to who installed the remote starter and have them look to make sure something is not crossed in the system