Headlights stuck on high beams

05crawlerTj

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Original poster
Joined
Oct 11, 2019
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6
Location
NAS Meridian
My 2001 jeep Sahara is stuck in high beam after replacing the Chinese leds the previous owner put in. I replaced them with sylvania silver star h6024 and now they won’t come out of high beam. If I unplug 1, I can occasionally get the low beam to work and use the switch to put it into high, but as soon as I plug the second one in, they only stay on high.
 
Sounds like your MFS (headlight) switch has failed. That's a simple circuit with no relays so replacing the switch should fix it. Unless the previous owner screwed up the wiring somehow.
 
If you messed with the headlight grounds on the grill and the connection is bad, the headlights will default to high beam.
 
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I would check the function of the MFS first (as previously recommended) and then verify the condition of the separate headlight wiring harness (if installed).
IF the PO installed a cheap Chinese separate wiring harness; the wiring layout and relays (not Bosch style) that their manufacturers use can be different.
 
When I bought my Jeep, on my 8+ hour drive home the LED lights the previous owner installed, were stuck on high. The switch was not responsive to dimming them- When I got home I pulled/reinstalled relays- disconnected/reconnected plugs to the headlight. Ultimately I don’t know exactly what I did under the hood but they went back to behaving as they should. Might have just been a dirty ground.
 
Must be a Florida Jeep. Many vehicles here apparently only have high beams.

here we just dont use them in the predawn/dusk hours- just dark shadows motoring along with traffic that you can barely see.