I have standard running lights (no ballasts). Passenger side headlight is intermittent. I replaced the bulb. Made no difference. What's the deal??

 

You have a broken wire (or a bad connector) somewhere that sometimes makes a connection and sometimes not. The only thing the ecm knows is there is a broken circuit as it is only looking for continuity. Have you ever had a light bulb where the filament is broken, but when you shake it the connection is re-established and the light will work until it is shut off and the filament cools down and separates again? Same thing.

 

That makes perfect sense. I will inspect closely today and report back. Thanks

 

I posted info on mosfet (inside the light control module) controlling the lights.
If you get to that point, you will need to solder the new mosfet in.

 

Take a close look at the connector. Its common to melt.

 

Sounds reasonable. Please tell me more. Where is your post? Where is the Light control module? I'm a former electronics tech. I am a very capable solderer.

 

I replaced the bulb thinking that was the problem. I have heard when they melt...they melt good. Mine appears ok, but I will take another look. Thanks

 

I checked voltage at the plug. It was good. I looked inside the bulb plug and there was a wide gap for the tiny bulb pins (not making contact). When I tried to fix it, the plug crumbled in my hand. I bought a $10 plug replacement at O'Reilly's and it's working again.