Help. My wipers, int. lights, and washer are not working. Replaced multi function switch and tried new wiper motor. Fuses and relays seem ok.
1998 F150 4.2L auto

 

pick up a haynes manual. it has all the wiring diagrams in back. its rare for wiper motor to go.

 

Few questions.

Q1. Has it been raining a bit in your area ?

Q2. When you say interior lamps, is this with the door only, or also with the interior light switch ( instrument dimmer switch ) as well ?

Test items on the wiper ( the relay is in the Battery Junction Box, aka BJB, or under hood fuse panel )

T1. pull the wiper hi /lo relay and jumper pin #3 to pin #4 ( low speed )
T2. jumper pin #3 to pin #5 ( hi speed ).

For the above tests,This should be the relay piin out, I think it is a half size relay.


Good luck, let us know the answers to the above, and we can move forward from there.

 

1. It has been raining quite a bit over the last month.
2. No interior light or map lights by door or switches
3. Assuming had correcte relay. #3 in BJB (W/S/W, HI/LO) jumped 3 to 4, and 3 to 5, no dice.

 

Sounds like another leaky windshield and water got into the usual suspects.