It seems I've found my first problem on my '91. The blue high beam indicator does not light when flipping the switch. I've had the cluster out and the bulb is fine. I went and switched between bulbs in it to confirm if it was burned out. It wasn't. It's not a big deal. I can switch between low and high and they work normally. The indicator doesn't work on the flash either. So I'm now a little stumped.

 

Stock headlights and harness or some sort of led retrofit?

 

The PO said he installed LED headlights but they say halogen on the lenses. They give off a whitish blue light that are really bright. There's also some Hella lights but they are on a separate circuit.
Could the head lights be causing the issue?

 

Did you test the circuit board where the mini housing screws to the cluster? Maybe he meant LED dash lights? Is it a standard bulb in the cluster?

 

See if the beam indicator is coming on but really, really faintly. That can happen when you start playing with the wiring path from things like led headlights or harnesses. Or just pop the hood and fish around and see what’s going on at the headlights.

 

The dash bulbs are all original. There are no signs that the cluster has ever been removed before.

I was checking things with no lights on in the cab while in the garage. It was actually quite dark. Everything under the hood looked normal with no signs of hacking. Only new wiring was for the Hella lamps and none of it is tapping into the headlight wiring. It may be the new lamps that are causing the issue. I'll have to remove the brush guard to get the grille off to unplug the lamps.

 

Toyota uses the low beam filament as part of the circuit to light up the high beam indicator.

If it's a led retrofit of some sort, there probably isn't enough current to light up the high beam indicator.

Temporarily put in a old style lamp (one is enough) and see what happens.

 

https://www.yotatech.com/forums/f116.../#post52450940

 

I've heard LED's do some odd things with circuits. I learned something new today. I'm glad it's not something weird with the wires.
Thanks!

 

this^^^

 

Well now I need to find a regular lamp somewhere. I haven't had anything that used them in a very long time. The closest thing I have is maybe I could borrow one from my '56 Fairlane to test it. Even though they're round it should still have the same pins.

 

Sealed beams are pretty inexpensive. I’d send you one for shipping but it would probably be cheaper and quicker to try to grab one at a parts store.

 

Thanks for the offer but as you say they're cheaper at the AP store. I could pull a lamp from the '56 faster that it would take me to get to a parts store. The truck will be a different story because of the brush guard. I doubt I could reach one of the lamp harnesses from inside to engine bay. I bet the wiring is like everything on the truck. There's probably just enough slack for only baby hands to grasp them.

 

IIRC, the pins are 1/4-inch male and female, so if connectors are different you can make an adapter pigtail using combo of 1/4-inch crimp terminals. Keep it in truck when your done for future troubleshooting/repairs.

 

if i'd come across the "motorcycle resistor" back when i was looking for a solution to my own hi-beam indicator issue, i would have tried it. as it was, i solved the problem by installing an led in the indicator lamp position, and now have a bright blue hi-beam indicator again.

 

This would be the cleanest solution.
@Wallytoo, wud u remember PN or link to LED u used? Best to use a proven one like yours.

 

i think i posted it in your build thread!

edit: oh yeah. high beam indicator LED bulb

 

I installed regular headlamps and the indicator works like it should. Of course they're not as bright a LEDs but the beam pattern is far better. The LED's in low beam but seemed to be just a big scattered white beam. It was like the beam was totally unfocused. They were really bad in fog. I was in a total whiteout The high beams were more directed and focused but impractical in normal driving if there were oncoming traffic.
I'm happy with the plain old lamps. They're bright enough for me. They're also easy to aim.
I'm keeping the old lamp bodies because I found out H4 bulbs will work them. I'll probably try them when the regular lamps burn out. I'm going to try to see how the LEDs might work on my Excursion.

 

https://www.yotatech.com/forums/f116.../#post52496815

 

Thanks for the tip but I switched back to regular halogen lamps not long after my last post. I also didn't like the light pattern from the LED's which ultimately helped me make my decision.