I just installed a set of these lights, from Toyota in a 60 series. I also had issues with the high beam indicator. I'll list what I did and what I found, and my thoughts about it. I AM NO ELECTRICAL ENGINEER!
1. Using a test probe, basic ground clamp and pointed probe with 12V bulb inside type
2. New lights and wiring installed I could not find the power for the OEM high beam indicator
3. I did find that the dash light circuit was working fine, lit up the probe when parking lights were turned on
4. I unplugged the new lights and put regular headlights in the OEM sockets. The high beam indicator circuit lit the
probe up without a problem when high beams were turned on. Lights worked perfect.
5. I plugged the new harness back in, same result, the probe did not light up when high beams were turned on.
6. I then checked the circuit with a multi meter when the high beams were turned on. 12v and change, weird.
7. These lights work as follows, low beams come on with switch. When switched to high beams, low beams turn off and high beams turn on. Both are NOT on at the same time.
8. I checked the circuit again with the probe and nothing, the probe did not light
9. When I had the high beams on and touched the probe to the high beam indicator circuit I noticed that the low beams came on with the high beams and I heard the low beam relay click. The probe DID NOT light up. When I pulled the probe, the low beams went out.
This is what I think is going on, based on past experience with a 60 and LED lights. The OEM lights are ground switched. I think these new lights are POS switched and this is done in the harness. I think this messes up the signal to the indicator light and throws 12V to the indicator circuit but it is working on the low beam circuit. When the grounded probe touches the indicator circuit it switches on the low beams but does not light the 12V bulb. Kind of like what a couple of you guys experienced with the indicator bulb not lighting.
I think that by replacing the standard bulb with an LED it carries enough current to light the bulb but not to complete the circuit to switch the low beams back on, or perhaps your low beams are coming on and you just did not notice it.
Either way, I probed the high beam relay and found the wire that lights up the probe when the high beams are turned on without lighting up the low beams too. I'll be using that one to light the light in the Speed Hut gauge.
Thoughts and opinions welcome for sure
