Breaks lights won't turn off - 2002 Ford Explorer

You said that you replaced the battery so in either case of new or another battery have a load test done as what you describe indicates a failing cell in the battery or loose t/dirty terminals.

the wiring between the door and body breaks down, new loom required

1st when the airbag light is on the system is disabled, so if u have an accident they will not work, as to the common cause read below.
When the airbag light is on it means a fault has occurred in the system and the airbag diagnostic monitor has disabled the system, the most common problem that turns the light on is a break in the connection to the steering wheel mounted airbag, this is due to a rotating ribbon contact that breaks under the steering wheel that connects the airbag to the wiring harness and the diagnostic monitor, the part is called th clock spring contact, a coiled up ribbon electrical contact that turns with the wheel

There is a shorted wire somewhere in that circuit. Check to see if any wires are pinched under a bracket or brace where he was working. I have seen it where it was a light bulb the was bad. Need someone familiar with a volt/ohm meter to help trace problem. Good Luck. You did not state where he had been working.

Have you checked the brake light bulbs are OK?

The timing belt syncs everything in your motor to work at the same time, the spark plug ignites, the turns the piston, then turns the cam then turns the transmission...all have a certain timing that each one needs to take place and if that is out of whack your car won't work properly, timing belts should be changed every 50k miles. most likely won't be able to do it on your own because the engine mounts need to me removed in order to get a new belt on and you need a timing light as well. Spend the 400 - 500 bucks to have someone do it, if it breaks it could cost around 1200

Probably in the switch..But another place to check is the ground to the GEM module..Pull the kick panel on the driver side,where the parking brake is..Once you remove the panel ,there is a small ground wire that often breaks and can make the wipers act crazy and make the dome light acted up as well..Ive seen it twice

Look under the dash, follow the brake peddle untill you find a switch, it's the brake light switch, try adjusting it (it moves in and out of a plastic insert, may take a little pressure to move) there should be two wires that connect to the switch, when the brake peddle is not in used the switch breaks the circiut, push the button on the switch, brake lights should go out, if not, check for power, replace if nessasary

I, feel sorry for you, after reading your problem, but don't worry you visit the Reliable-Store they will help you for sure.They have repair manuals at a very less cost.
2006 Nissan Altima

run a compression test,it may be an interference engine when the belt breaks it also bends engine valves