T OYO TA T R A I L S High Beam Indicator Malfunction Hello Roger, I stumbled across your site after I bought a harness from eBay that was supposed to be for my 1987 Toyota pickup and did not work. They refunded my money and told me to keep the harness. I rewired it as per your diagram and the low and high beams work but my high beam indicator light does not come on. Any ideas? Thanks. Denny Smith Follow-up From Denny Hello Roger, OK, I see it. Is the resistor supposed to see voltage all the time the lights are off? 12V comes from the 30 terminal and then 12V goes through the 87a contact and then flows through the diode, then to the resistor? Thanks. Denny Smith Hi Denny; The resistor should only have voltage and current running when the relay is on and 87a (and 87) are closed. If you have a relay where 87a is closed when the relay is off (NC) and 87 is closed when the relay is on (NO), then use 87 instead of 87a. Some relays, like the ones I used, have two separate contacts that work together. Other relays have contacts that are opposite of each other. So it depends on what type of relay you have as to how you detect that the high beams are on. That is all that is happening, as noted on the web page. The relay sends current back to the high beam indicator to turn it on. Roger Hi Denny; See this link: http://www.4crawler.com/4x4/CheapTricks/ Headlights.shtml#SPtoSG. And: http://www.4crawler.com/4x4/CheapTricks/Headlights. shtml#TechInfo. 12V 12V COM__LO__HI (red) (red) (black) (black) 30 88 85 D1 R1 D2 (black) (light blue) 86 87a (red) Final Follow-up From Denny Hello Roger, OK, thanks for the help. I figured it out. I had two of the wires coming from my stock headlight socket going into the harness backwards. Everything seems to be working good now. Instead of using a 1-watt resistor, I used a 10-watt, 10-ohm resistor. Is that OK? Thanks. 85 30 87 87 (yellow) (blue) (black) High Low Com (blue) (yellow) (blue) Denny Smith High Low (yellow) (black) Hi Denny; Yes, higher wattage is better on the resistor. I used a 5-watt, 27-ohm for my heavy-duty version. That resistor and the dash bulb are in series, so each only sees part of the voltage and power dissipation. You can actually vary the resistor value to adjust the brightness of the indicator light on the dash. I found the 27-ohm resistor dimmed that overly bright blue light down so it was less obnoxious at night. Glad you got the issue sorted out. Toyota, with their switched ground wiring, makes it difficult to adapt aftermarket wiring kits and then on top of that, they cut costs for that high beam indicator by saving a contact on the headlight combination switch and instead, driving the light off the low beam headlight contact. Roger PHOTO BY ROGER BROWN (black) Com Specifically, R1, D1 and R2. Look in the middle of the wiring diagram above. That assumes you have a DPST (or 2-Form-A) relay such that 87 and 87a are both closed when the relay is on. If you have a form-C (SPDT) relay such that the 87 is normally open and 87a is normally closed (i.e., opposite of 87), then you need to use the 87 contact to send the high beam indicator power back to the dash via the diode/resistor array. Roger 36