The high beams work. the low beam sockets ohm out and have 12 volt with no bulb in. When I put a bulb in one side or the other it does not come on and the other socket losses the voltage? What am I missing. Have new bulb thinking one of the old ones was the problem. Still weird.
Also the dimmer switch has been changed twice with new one. And the voltage is good when moving from low to high.

 

Found that just on the low beam side the positive is grounded somewhere. Traced it back to the dimmer switch and found nothing. So under the dash I guess. Pulling the seat out soon to replace gas tank and steering column. Deal with then when I have more room. Too hot to drive it anyway, 105 today.

 

Sorry I can`t help, wiring is my weakness. Hopefully someone will chime in.

 

Ok first I would not use a ohm meter use a test light and not the new LED type.

You know you have power from the head light switch as the high beams work.
So going from the head light switch power goes to the dimmer switch.
All it dose it flips from low to high and back.

So if you have high but not low I would take that test light I told you about above.
Unplug the dimmer switch and see what wire is the feed to the dimmer switch.
You can then take a jumper from the power wire to 1 of the other wires and see if you have power out at the bulbs.
If the bulbs are plugged in it should light up.
Now move the jumper to the other wire and the bulbs should light up again, either brighter or dimmer.

If you are using the test light at the bulb plugs you need to know what wire of the 3 is the ground.
Once you have that the other 2 are high & low.
It is just that easy to test the head light system.

BTW I was going to use my truck to go to work and turned on the head lights and nothing, just parking / running.
I did have high beams but no low beams. I did not want to mess with it at 4am so will need to look into it at some point.

Thing is I have relays that run my head lights as the bulbs now get full 12 volts and the load no longer goes thru the switch.
The switch only powers on & off the relays, low power on the switch and wiring.
What is nice is it is plug and play, no cutting of wires and I could have plugged the trucks harness bad into the bulbs and had lights if I wanted to.
The relay kit you can get from LMC, Ebay and think any of the truck parts suppliers.
Dave ----

 

With no bulb plugged in I have 12v on the low beam circuit at front of truck on both sides. If I plug a bulb in either side the voltage on both go away.

 

Sorry getting back so late.
I would go back to the dimmer switch and see if you have volts with the lights unplugged and plugging in.
Remember the dimmer will have a power in and it switches power out to the 2 different wires / legs.

I think also as a test I would unplug the dimmer and use a jumper between the power and each of the other 2 wires with the lights plugged in.
I am thinking that the dimmer switch is faulty and letting voltage thru to get a reading with a meter but not enough to power the low bulbs.

Have you tried new bulbs? It would not be the first time both bulbs would be bad at the same time.
Dave ----

 

So how did you make out, what did you find and did you get it fixed?
It may help others if you post what the fix was.

and yes others have been knocked down by 2 bad bulbs
Dave ----

 

I have only had 2 days off in the last 3 weeks so no time to get back to it. Yard work and 100 deg temps take up whole day. Off next three days and will defiantly post when I find issue as I know it may help someone else in the future. Thanks

 

Finally had time to get back on the truck lights today. Found one leg of the three-wire connector for dimmer switch was bad. Have a single wire ran for now so everythings working as it should. Anyone know where to get a new connector for the dimmer switch?

 

I thought you would find the issue at the dimmer switch.
Have you tried the local parts store?
You may find it on a hook in the "HELP" area.
I know Auto Zone has a bunch of electrical stuff in 1 area, it might be there also.
Dave ----