Unplugged plugs and headlights not working - Mustang Evolution

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Old 07-26-2015, 09:53 PM   #1
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Unplugged plugs and headlights not working

Hey guys, just got my 89 gt tonight. Noticed fairly quickly that the headlights werent turning on. It has new bulbs and a new fuse. I cant even get an indicator on the cluster that highs are on when i switch them on. Any idea? Also, i have 2 plugs unplugged. One is coming out of the headlight cluster on the drivers side. The 3 pronged green plug is near the throttle body. Any ideas?

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Old 07-27-2015, 09:06 PM   #2
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The 3 prong plug in the second picture goes to the evp sensor which is bolted to the egr valve.It doesn't look like you've even got an egr valve.I'm not sure what the other plug is for.The headlight switch could be bad.Is the parking light & signal light both working on the driver side??You've got a wiring harness for the headlight, parking light & signal light too so if one of those aren't working, the plug likely goes to the non working light.You've also got an airbag sensor on the driver side which uses a wiring harness & the low coolant sensor inside the reservoir bottle is also in that same vicinity.What are the two wire colors on this harness??
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Old 07-27-2015, 09:21 PM   #3
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Could be as simple as the switch, would not be the first time. Pull the switch and jumper the plug and see if they turn on.
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Old 07-28-2015, 07:15 AM   #4
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The plug is red and black inside.

My father who's had a few of these also said its probably the switch. All of my lights are working but the actual headlights.

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Old 07-28-2015, 08:19 AM   #5
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Muds internet guess is when you plug in the headlight if that is where the other plug goes is you'll be on your way to finding the short....buy fuses.
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Old 07-28-2015, 11:08 AM   #6
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Does the wiring harness have 2 wires & look like the one shown in the picture below??If yes,it does indeed connect to the low coolant sensor.The 87-89 uses a 2 wire plug & the 90-93 uses a 3 wire plug.
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Old 07-28-2015, 11:23 AM   #7
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Thats the plug. So it has nothing to do with my lights. Ran a jumper and still getting everything but headlights

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Old 07-28-2015, 11:36 AM   #8
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Time to start following wires. True story I had a Mustang once where something chewed up a bunch of wires in the engine compartment. Could have been some sort of critter or varmint?
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