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Old 01-15-2005, 06:21 PM   #1
Andrman
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World Rally Blue

Default UK300s w/ relay harness: low beams only come on with highs

I have just re-done my wiring harness for my UK300 lights. It's a 2 relay setup, one a power (low beam) relay and one a ground relay.

Now that I've put everything back together I have a problem: the low beams only come on when I have the stalk in the high beam position (flash to pass or pushed forward, both work).

So far I've checked the two headlight system fuses in the box and they were fine.

I have not disabled my DRL's and wonder if this may be a problem. My only other guess is that one of my wirings - a piggy-back wire off pin 87 (output to lowbeam) of my power relay to pin 85 of my ground relay (it's supposed to only allow the ground relay to turn on when the lights are on). Does anyone know if I can use a multi-meter to test if this wire works? Or if it would even be causing the problem?
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Old 01-15-2005, 06:46 PM   #2
Andrman
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Well I checked the wire in question, and it is fine. So I'm having a problem outside my wiring harness, since all other connections check out fine too.
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Old 02-02-2005, 04:04 AM   #3
GravelRash
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Hey there, sorry I missed your problem description in the other thread - haven't been browsing much recently.

To the best of my knowledge all the wiring schematics posted for use with the UK300s assume that you've disabled your DRLs by unplugging the relay connector under the dash in front of the passenger door.

If you don't do that all bets are off! Actually I would have bet that the result would be that your low beams were always on in any condition that would previously have resulted in the DRLs being on...but that's apparently not the issue in your case. However, I don't think you'll arrive at a valid solution w/o disabling that DRL relay.

Did you get rid of the bizarre behavior you described in the other thread, i.e. the poltergeist that had possessed your headlights? That sounded like you had some kind of intermittent cross-pollination short, e.g. the B+ relay was being switched on somehow even when the headlight switch wasn't on; power from the battery side somehow shorting to the switch + side?

I've experienced sticking relays before (not these Hellas), which could account for some of the symptoms, but I've never had one "stick on" after it had already successfully turned off! So I don't think that is/was the root of those problems.
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Old 02-02-2005, 07:04 AM   #4
Andrman
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Hey, thanks for the response, I haven't read it totally because it is 5 am and I haven't slept yet , but the problem was determined to be a broken relay. I replaced the relay and it works normal again. The old one has some weird metal powder leak out of it if you tap it and buzzes if you try using it. These relays are supposed to be heavy duty, but even the crazy 60 degrees and humid day followed by 10 degrees can make a solid device fail
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Old 02-03-2005, 04:38 AM   #5
GravelRash
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Was this one of the Hella relays from Daniel? If so I'm sure he'd like to know about it; might even want it back to fwd on to Hella...
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Old 02-03-2005, 08:18 AM   #6
Mulder
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Did you have the relay mounted in the engine compartment with no protection (electrical tape and/or heat shrink around it)? If so it may have been damaged by water intrusion and internal corrosion. You should be able to open up the relay and look inside. In the future I'd suggest you take steps to protect all relays and electrical connections installed under the hood to prevent further problems.
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Old 02-04-2005, 05:48 AM   #7
nhluhr
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Relays should also always be mounted upright so the wires come out the bottom... this prevents water from just sitting in there and cooking.

I made a bracket to hold a 4-block set of them:
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