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Old 01-20-2020, 01:30 PM   #1
rtam
Scooby Newbie
 
Member#: 13267
Join Date: Dec 2001
Location: Vancouver, BC
Vehicle:
2002 Impreza 2.5RS
Silver

Default Bugeye: why is power coming through high beam pin?

Hello All,

I recently bought a relay harness from Daniel Stern to boost the voltage in my Morettes. I was naive and plugged the harness into the Morettes without removing the Morette relays first, and something (probably bad) happened, and both low and high beams would turn on when I switched on the low beams.

To troubleshoot, I took everything off and checked the 9007 plug from the car and found that the right pin is grounded, the centre pin has power when the headlight switch is on, but the left pin (should be high beam) also has power (12V) when only the low beams should be on. When I turn on the fog lights, the voltage on the left pin drops to ~5V.

This is very confusing to me, because I thought only the centre pin should carry power, and the other 2 are switched grounds. I'm hoping I didn't create a bad short somewhere, and would really appreciate some help in diagnosing the problem!

Thank you,

Roger
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Old 01-24-2020, 11:31 PM   #2
CosmoTheCat
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Member#: 3409
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Oly
Vehicle:
98 My FMIC
Is bigger than yours.

Default

There will be voltage on pin 1 when the high beams are off because the high beam indicator ties into that wire. It's normal. If you pull fuse 9, it'll go away. As far as the voltage dropping when fog lights are on, I imagine you're seeing drop due to the fog light indicator lamp. But that's just a WAG.

As to your problem, it sounds like something is incorrect in the harness between the Subaru connector and the bulbs themselves. I'm not familiar with how morettes are wired or the harness you bought.

Last edited by CosmoTheCat; 01-24-2020 at 11:43 PM.
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Old 01-25-2020, 07:06 AM   #3
Mulder
Trust no one
Moderator
 
Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
02 RAV4 MT
15 WRX/05 GTO

Default

When I had my Morettes I disconnected all of the relay stuff in them (not really sure why it was all there in the first place) and made my own relay harness to supply battery power to the low beams with the negative side directly grounded. The highs are already connected to the battery through the Morette wiring and fuse.
I also unplugged the DRL control module in the passenger kick panel area, this might be a problem for you in Canada as they are legally required up there.
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Old 02-05-2020, 06:06 PM   #4
rtam
Scooby Newbie
 
Member#: 13267
Join Date: Dec 2001
Location: Vancouver, BC
Vehicle:
2002 Impreza 2.5RS
Silver

Default

Thank you very much to both of you for your replies! I realized my question was a noob question, so I went and did a bunch more investigation and found that my car's wiring is probably still fine, like Cosmo said. So I turned my attention back to the harness, which I had assumed was good because Daniel Stern has such a good reputation. But now I'm not so sure it's completely correct. I made a diagram of the harness:



Both relays seem to be switching on correctly. The main problem is that both low and high beams would always switch on, even with the headlight switch on low, and the wire at the very top started burning. I am definitely not an electrical expert, but the loop connecting 87 and 87A makes me suspicious. I believe that connection is meant to keep the low beams on when the highs are switched on, but I wonder if they made some sort of mistake.

Any further advice would be greatly appreciated!

Roger
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Old 02-05-2020, 10:12 PM   #5
satrya
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Member#: 5887
Join Date: Apr 2001
Chapter/Region: BAIC
Location: Fremont, CA USA
Vehicle:
2002 GDAA (bugeye)
797 (blaze yellow)

Default

After the independent foglight mod (which removes the connection between the OE high beam filament and the foglight filament), my OE 9007 connector behaves like this:
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