External Lights Troubleshooting
I own a 1990 Ford F150 XLT Lariat. I've owned and DIY repaired quite a few different makes & models of vehicles. This truck is the first Ford pick-up I've owned. I bought it two years ago from the original owner. I've had very little trouble with it...until now. Even though I have an electrical engineering degree and can troubleshoot just about any kind of electrical/electronic circuit if I have a schematic, auto electrical systems can still be kinda quirky. Anyway, here's the problem that popped-up two days ago:
With the headlight light switch in the full on position, neither of the front amber parking lights nor the two tail lights will turn on. The hi/lo beam headlights work properly, and the rear brake lights, and white back-up lights all work correctly. Further, the front & rear turn signal lights in both the turning position and in the emergency flasher mode, work properly. I pulled & continuity checked all of the fuses in the fuse panel on the lower left of the steering column, and none are blown. I have a Haynes repair manual, but, it's not detailed enough for me to pinpoint the source of the problem. I don't want to take it to a mechanic & pay a ridiculous amount of money to get my parking lights & tail lights functional again. I am obviously missing something, but, cannot find a more detailed troubleshooting guide on the internet. Maybe you can help? Thx! Steve...Seattle, WA