My 2003 ford explorer xlt hazard indicators on the dash light up when the heater or headlamps are turned on and the truck won't shift out of park until they are turned off
When I start the truck all work fine. if i turn on my headlights they work, but the hazard indicator lights on the dash light up and the truck won't shift. this also happens if you turn on the heater, only the heater doesn't work as well when it does this. mechanic checked fuses and all and hooked it up to his scanner with no luck.
Cars & Trucks - Ford - 2003 Ford Explorer Sport XLT
Answers & Comments
Power back feed through the electrical systems ,maybe . Looking at a wiring diagram to see if these share a body ground point would be the thing to do. Do you know anything about automotive electrical circuit's ? What the difference is from B+ voltage side of the circuit and the ground side . Do you know what a wiring diagram is ,how to read one ? Scanner wouldn't show anything in these cases . Testing the electrical circuits for the affected systems is the only way .
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Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size . Under system click on lighting ,then under subsystem click headlamps .Click the search button then the blue links . Then change systems , from headlamps to HVAC - heater , then to transmission an shift inter lock ,this has a electrical controlled lock solenoid that won't allow the shifter to move ,unless drivers foot is pushing the brake pedal. Watch the videos ,buy a DVOM - digital volt ohm meter . test the circuits . Or show all this to your mechanic .