LED headlights

[Fingers]

So, I got some LED headlights that were from amazon, but I only paid $7 for them. Using a power supply, they do work as they are supposed to. 1 ground, 1 power for low and 1 for high. Problem comes from the truck side. Using a test light, this is what I get:
http://www.mightyram50.net/vbulletin/attachment.php?attachmentid=27970&stc=1
Not sure how that could be translated to run these lights. It's a 1st gen truck, btw.

[SubGothius]

I infer you were just connecting the test light terminals across pairs of connector terminals to get those results?

The better approach to distinguish the hot wire from ground is to connect one terminal of the test light (the alligator clip, if it has one) to a known ground, then touch the other terminal probe to each of the connector terminals to determine which one is getting power with the switch in each position. To confirm which one is the ground, connect the clip to the battery (+) then touch the probe to your probable-ground terminal in the connector, which should then light it up.

Anyway, your diagram does look typical for a 5x7" rectangular combo-beam (H6054 type) where, looking at the connector end, the right terminal is a ground, the top terminal gets +12VDC when the low-beams are on, and the left terminal gets +12VDC when the high-beams are on.

[Fingers]

Those results were obtained by having the alligator clip on the negative battery post while probing each terminal.

[Fingers]

I swear this factory light relay is a living organism!
I used some wires and connectors as a go-between so I didn't have to mess with either the truck wires or the headlight wires, keep everything stock. The ground I went directly to a body ground, low beam on top, high beam on left. I had just the passenger side hooked up for this test. Works flawlessly. Hook up the other light in the same way, now I only have low beam. No high beam.
Must need a PhD in electrical engineering for this "plug&play" stuff.
just for kicks I plugged the original headlight back in the driver's side, now the LED only has high beam. I am at at loss as to why which wire has power keeps moving around.
Hell of a voltage drop, too. I got 12.5 at the battery and between 7 an 9 at the headlight plug.

[xboxrox]

Maybe your truck don't wanna blind oncoming drivers :shrug:

[ostlar]

I noticed something funky when I tried hooking up a relay control signal from the high beam for extra LED lights.

Whenever I use the light horn (and don't click it over into permanent high beam) the high beam lights activate, butthe relay doesn't turn on, only when I click it over into permanent high beam.

I started measuring power to the lights, and it seems like the light switch is controlling the ground, and the lights are constantly fed +12V for som reason?

Check out the wiring diagrams (http://www.mightyram50.net/vbulletin/showwiki.php?title=Electrical+System:Entire+1st+Ge n+1986+Truck+Electrical+System) provided on the Wiki of this site, maybe they can help.

[camoit]

Are you talking about flash to pass

[Fingers]

So, Toyota wired their headlights to switch grounds instead of power. Maybe I'll try the relay scheme for Toyota and see how that works.
According to this information, that is what I have to do. We will see...
http://www.mightyram50.net/vbulletin/attachment.php?attachmentid=28014&stc=1

[camoit]

The center pin should be ground and switching between high and low should just move power side to side. Unless you have a bad ground on one light. Then it can act like a train crossing signal and it will blink side to side depending on if it’s high or low

[Fingers]

Just for clarification, the sealed beam headlights work as they are supposed to.
The relay kit did not solve this issue. I tested the headlight connector again, meter grounded to the battery.
1st test: lights off = ground on both sides, nothing on top.
lights on = ground on top, power on right side
High beam = ground on right, power on top and left.
2nd test: lights off = ground on top and left, nothing on right
lights on = ground on right, power on top, nothing on left
hign beam = ground on top, power left and right
How does the ground keep switching pins? I guess I will just have to stay with the sealed beams at 7 volts as there is no sense in this wiring setup.

[Fingers]

This thing is in the headlight wiring, what is it? I assume it's a relay for the park lamps, headlights and high beams. I cannot find this thing anywhere, and the part number printed on it brings zero results.http://www.mightyram50.net/vbulletin/attachment.php?attachmentid=28056&stc=1http://www.mightyram50.net/vbulletin/attachment.php?attachmentid=28057&stc=1http://www.mightyram50.net/vbulletin/attachment.php?attachmentid=28058&stc=1

[FMS88]

Google 056700-3060 and a couple sites call it a light control relay with the Mitsu P/N of MB046436. Appears to be available but pricey. Have you removed the metal cover? With it off you should be able to assess the condition of the coil and contacts.

Also, found this thread that has a wiring diagram for a 1986 truck and it shows the relay. Hope it helps.

http://www.mightyram50.net/vbulletin/showthread.php/9067-1986-Dodge-Ram-Wiring-Diagram

[Fingers]

Wow, that's quite the price for what is basically 2 relays.