another truck problem

[Quartlow]

Was slaving away at the freight shaker today, trying to get all the electrical sorted out  >:( >:( Enough to make a preache rdrink I tell you, some folks shouldn't be allowed to have tools, , Sorry back to the problem

Had to rewire the head lights heres the problem on a 4 headlight system on low beam the two inside high beams glow a litlle, if you remove any head light from the circuit it quits doing it. I figured I had a wire crossed some where so I ran all new wires from the dimme rswitch to the headlights. Still did it

Ran a ground right from the battery, still did it.
Isolated all the head light circuits from the dimmer switch to the hedlights from the truck ran a wire from the battery to the dimmer switch, still does it. Swapped out the  headlights with spares, still does it.
bypassed the dimmer switch
STILL DOES IT!!!!!!

I'm about to pull my Dang hair out. Went over all the wiring a second time. It's about to drive me nuts, so I quit for the night

Excuse me while I go bang my head on a corner somewhere.

[isawlogs]

  I hate wiring ... had to rewire the mill this morning ... and they still did not work like they suppose to ....  >:(   
Sure am glad I left the cumins alone ...  ;D

[Kirk_Allen]

Try a Hot wire from the battery directly to the back of the light and a good ground to the frame.  Bypassing the plug assembly completley. Once you know they work when hotwired direct then connect the hot wire to the plug.  

Dads old truck had a similar problem and turns out it was in the harness plug on the drivers side.  Took hours to troubleshoot.  Good thing I got lots of hair to pull ;D

[Brucer]

Quartlow,

Hopefully by now you've got this sorted out. But just in case, you're still tearing your hair ...

These are classic symptoms of a faulty ground connection on a dual filament high/low beam headlight. A fast way to confirm it while the problem is occurring is to check the filaments in the high/low beam units. If both filaments are lit, than 99% of the time it'll be a faulty ground in that unit. Staring at a lit headlamp isn't a real enjoyable experience so I use a #4 welding filter (used for acetylene welding & burning) to cut down the glare. Heavy sunglasses might work.

The ground fault could be where the ground connects to the body (rust, loose connection, paint between the connection points); in the wire itself (broken wire inside the insulation, loose crimp terminal); in the connector (corrosion), or in rare cases, a broken wire inside the bulb itself (happened to my brother once).

When I had a new body put on my truck, it took me 3 weeks to get all the lights working properly -- they'd fail or go haywire intermittently. Every single problem eventually turned out to be a bad ground connection. DanG body shop guys just figured those wires were like sheet metal -- screw 'em on so they don't come loose, and everything will be cool  >:(.