Relays and Euro lights
b.m.benz at prodigy.net
Tue Jun 4 08:07:32 EDT 2002
Simple. If I were unfortunate enough to live in Chicago, I'd put the relay
package in a plastic bag, just like Audi does with the ECU to protect it
from those that can't keep their drain holes clean.
> From: Chris Covington <malth at umich.edu>
> Date: Tue, 4 Jun 2002 09:50:24 -0400 (EDT)
> To: Bernie Benz <b.m.benz at prodigy.net>
> Cc: QSHIPQ at aol.com, 200q20V mailing list <200q20v at audifans.com>
> Subject: Re: Relays and Euro lights
> But Bernie, pin configuration aside, you're missing an important factor -
> weather - when you're saying certain in-hood relays work fine for you in
> your dry, (warm?), non-salted-road, Western climate (of course they
> would!) and that they should for Scott as well in his cold, wet,
> road-salted Chicago climate.
> You have more margin for error from Mother Nature, where Scott doesn't. I
> think weather has more to do with it than the amount of pins in the
> '91 200q20v
> On Tue, 4 Jun 2002, Bernie Benz wrote:
>> Welcome back, Scott. Good to hear from you.
>> Sounds like you need to use better relays, or move from Chicago. A 4 pin
>> relay is not the best choice for this high current, two relay application,
>> IMO. Bosch and PB make a 5 pin cube relay specifically for this type app.
>> in which there is a common input to two sets of 30A NO contacts and dual
>> outputs, thus dividing the current between two sets of contacts and output
>> terminals. This has great wiring advantages in that only one #12 wire need
>> go into each socket connector. In your enviroment maybe the relay cover
>> needs to be replaced with a little silicone caulk.
>> In my 44s I've had my dual relays mounted on the frame member just behind
>> the pass headlight, near where the jump post used to be (it's now airborne).
>> No heat, no corrosion, no fuses, no problems, and wiring runs are as short
>> as possible. In the 89 chassis they are mounted on top of the pass strut
>>> From: QSHIPQ at aol.com
>>> Date: Tue, 4 Jun 2002 08:34:00 EDT
>>> To: b.m.benz at prodigy.net, brianl at starsys.com
>>> Cc: 200q20v at audifans.com, urq at audifans.com
>>> Subject: Re: Relays and Euro lights
>>> [ Picked text/plain from multipart/alternative ]
>>> Just read this one.... The case of "new" spec vs element exposed reality.
>>> The problem with relays is they have a life, specifically, they have a half
>>> life. The harsher the environment they operate in, the shorter the half
>>> life. In the case of my "underhood" installed relays in my urq for
>>> the crap wiring job from alt to relays located them right beside the
>>> (heat and water/salt). Which reduced the half life of my relays to less
>>> two months. When these pups get hot and/or wet, there is no guarantee of
>>> spec. In fact, in my case '83 urq, the relays would randomly arc closed,
>>> this is *with* a 30 amp inline fuse (then run the battery down). This
>>> wouldn't happen if it was sunny, pretty much a guarantee if it was
>>> raining/snowing (after shut down the lights would either stay on, or the
>>> buildup would turn them on in the middle of the night)
>>> I put up with this for 4 changes of relays in 6 months, until I recently
>>> moved and properly mounted them in the glovebox area, and strung 10/12guage
>>> wire from the battery. Nary a problem since. The problem with applying
>>> 200amps relays is a couple fold. IF your relays are marginal (not new) you
>>> DO risk the chance of not only arcing them, but welding them closed AND
>>> blowing the bulbs out. I'm only sharing BTDT. I assure you Bernie, I have
>>> and understand the operating specifications of *new* 12v 4pin relays.
>>> I'm only sharing what I see in practice, and personal experience. If you
>>> routinely replace your relays *before* failure, your theory/specification
>>> applies. IME, few routinely replace relays before failure. In the land of
>>> winter salt, underhood relays fail quite regularly, so do those high amp
>>> unprotected connections between relay and wiring. Mounting them near the
>>> battery post means you put them near the hottest heat generator too (turbo),
>>> which means half life ain't great.
>>> "Don't fix if it ain't broke" - ok, but when it does, "Fix it right the
>>> time" (?)
>>> My .02
>>> Scott Justusson
>>> practical relay install specialist
>>> In a message dated 5/31/02 3:20:11 PM Central Daylight Time,
>>> b.m.benz at prodigy.net writes:
>>> Do you normally jump start your car with the headlites on? 200 amps will
>>> flow through a discharged battery with an applied voltage at the jump
>>> terminal of less than, or very little more than the normal system opperating
>>> voltage, and rapid chargers are voltage regulated, restricting the peak
>>> applied voltage to about 15 volts. They are designed to be idiot proof!
>>> Further, the arc over voltage of an open relay is well in excess of 600
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