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High beams problem!!
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Old 20 Mar 2015, 03:21 AM   #1 (permalink)
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High beams problem!!

2010 subaru impreza 2.5L. Second car already with same problem. High beams work but they aren't receiving full power because they don't shine as bright. All the other lights work fine. I checked all the fuses and I ran a extra ground from the highbeam wire and still nothing. One thing I noticed is that when you unplug one side of the headlights harness the other side highbeam shines brighter. I also noticed (if I'm correct) that the wires run to the drl module before they go to the headlights-->just a heads up if that helps. Please help! Also yes my headlights lense is clean and clear as can be.

Last edited by Gladiaer7; 20 Mar 2015 at 05:09 AM. Reason: Mistake
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Old 20 Mar 2015, 09:53 AM   #2 (permalink)
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Re: High beams problem!!

how many Volts do you have at each lamp plug
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Old 21 Mar 2015, 01:39 AM   #3 (permalink)
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Re: High beams problem!!

7 volts
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Old 21 Mar 2015, 07:53 AM   #4 (permalink)
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Re: High beams problem!!

so where are you losing the other 5 or 6 volts ?
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Old 21 Mar 2015, 06:29 PM   #5 (permalink)
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Re: High beams problem!!

No idea that is what I'm trying to figure out .I'm 100% sure my wire harness is good, no cuts anywhere
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Old 21 Mar 2015, 09:15 PM   #6 (permalink)
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Re: High beams problem!!

go to the relay and check that
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Old 23 Mar 2015, 08:54 PM   #7 (permalink)
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Re: High beams problem!!

Put in different relays. same problem
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Old 24 Mar 2015, 07:59 AM   #8 (permalink)
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Re: High beams problem!!

Voltage at relay ?
also what is the voltage with the engine off across the battery terminals, and what Voltage again do you get across the battery with the engine running ?
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Old 30 Mar 2015, 05:22 PM   #9 (permalink)
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Re: High beams problem!!

Engine running-15v
Engine not running-13v
Voltage at relay with highbeam on-12v
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Old 30 Mar 2015, 07:40 PM   #10 (permalink)
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Re: High beams problem!!

Just discovered that the high beam wires run through the drl module . 12v run into the module and only 5v come out. It's support to have 12v coming out. Also the module becomes very hot when the HIGHBEAMS are on. Replaced the module and still same problem
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