CK5
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Headlight Relay Harness
- Thread starter ‘89Jimmy
- Start date
From other pics you've posted, you have the quad 150mm headlights (the more common configuration for 89-91). That uses 4 smaller 2-pin connectors. If you are going to the earlier front end, that kit you have may work for that.
I thought I had included a 3rd photo that supports exactly what you said. Got it this time! Seems the older version is a H4 bulb style connector, which is what the new relay harness is. How hard would it be to convert the truck over? Has anyone here tried that?
I believe you can get the front headlight/parking/turn signal harness unbolted and unplugged from the firewall junction box and replace it with a harness (junkyard) to match the grill/core support you have planned. I took that route with my ‘82 to update to the 85-87 style grill.
I converted an LMC relay harness from the 89-91 quad light style, that uses plugs that don’t match the OEM bulbs but their own 150mm composite housings. Which is a not so sneaky way of getting you to buy 4 housings for stupid money through LMC. I called BS on that nonsense and modified the harness to work with the two bulb setup from the cheaper Cheyanne grill that used the h4 sockets.
Picked up a couple of h4 pigtails and wired them in, though when going from two bulbs per side to one per side you will be adding both high and low circuits to the h4 socket.
Pretty straight forward. In hindsight I should have just bought the correct relay harness for a two bulb system and it would have been plug and play. But since I already had the harness and did not want give LMC any more money than necessary I modified what I had.
If the earlier setup you plan on running is a 4 light system it’s just a matter of changing the plugs out. For the two light system you do the same thing I did.
Picked up a couple of h4 pigtails and wired them in, though when going from two bulbs per side to one per side you will be adding both high and low circuits to the h4 socket.
Pretty straight forward. In hindsight I should have just bought the correct relay harness for a two bulb system and it would have been plug and play. But since I already had the harness and did not want give LMC any more money than necessary I modified what I had.
If the earlier setup you plan on running is a 4 light system it’s just a matter of changing the plugs out. For the two light system you do the same thing I did.
Pretty sure it is.
That’s it, you can see in the diagram you posted how it’s part of the firewall bulkhead connector on the top passenger side.
Looks like they have a plugs kit that might work.
painlessperformance.com
GM Pickup Socket Pigtail Kit (Dual Square Headlights) (80-87) Part No 30352
Easily paired with our p/n 20205 Direct Fit Square Body Harness, these socket kits give you all the terminals and connectors you need to wire your exterior lighting on your 1980-1987 dual square headlight GM
painlessperformance.com
That kit looks like just the socket to splice onto an existing harness
Agreed, I'm not sure I could find one that would be plug and play (aside from a junkyard pull), so this might be the next best option.
