Component Testing Procedure
WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
HEADLAMP SWITCH - COMPONENT TESTING
| Circuit to test | Connect self-powered test light or ohmmeter to terminals | Move switch to these positions | A good switch will indicate |
|---|---|---|---|
| Headlamp | B1 and H | Off | Open circuit |
| Park | Open circuit | ||
| Head | Closed circuit | ||
| Park lamps | B2 and R | Off | Open circuit |
| Park | Closed circuit | ||
| Head | Closed circuit | ||
| Interior lamp | D1 and D2 | Knob rotated fully counterclockwise (in detent) | Closed circuit |
| Knob rotated fully clockwise (out of detent) | Open circuit | ||
| Illumination dimmer | R and I | Rotate knob clockwise | Ohmmeter will show smoothly increasing resistance |