Relays and Euro lights

Chewy4000 at Chewy4000 at
Wed Jun 5 08:46:12 EDT 2002

In a message dated Tue, 4 Jun 2002 11:28:38 PM Eastern Daylight Time, QSHIPQ writes:

> --
> [ Picked text/plain from multipart/alternative ]
> Bernie, comments inserted.
> In a message dated 6/4/02 8:27:28 AM Central Daylight Time,
> b.m.benz at writes:
> >Welcome back, Scott.  Good to hear from you.
> Love to nerd on 12v systems, 22 years of relays included....
> >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.
> I don't think so Bernie.  IMU, the 5 pin 87/87 (dual line out) are connected
> internally to each other, but the contact bridge between 30 and 87 is a
> single contact NO. In other words, the 87 dual feed is AFTER the relay
> contact. I don't show a "dual contact" 87-load relay application by any
> vendor, the dual 87 (after the bridge) just avoids one having to stuff two
> 10/12 guage wires into a single contact.  If you show a dual contact bridge
> SPST 5 pin relay, please share a part number.  I think you may be confusing
> the SPDT relays using the 87 and 87a ports, which have two contacts.  Those
> switch between 87 and 87a (dual points), they don't have a dual point jump
> between 30 (feed) and 87 (load).  In the 87/a application, you EITHER have
> contact on 87 (NO) or 87a (NC), not both.  And the 87 is considered the load
> contact, with usually a double amp rating over the 87a.
> I only show the 5 pin Bosch with dual 87 (single bridge/contact, dual 87
> internally connected after the bridge) as 0332019150/151/155. ALL of these PN
> have a single contact bridge between 30 and 87 and 2 x 87 load out.  What am
> I missing here?
> >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.
> This is NOT a recommended procedure by any relay manufacturer.  Extreme
> environment, water and heat are a relay's worst enemy.  Avoiding that is
> pretty easy in terms of concept, a lot more work in execution.  Hella lists
> the following conditions that cause/increase failure rate of relays:
> *  Burnt contacts
> *  Burnt relay coils
> * Oxidize connnection pins
> *  Overloading
> *  Wear and tear
> * Corrosion
> Given the above and the choice between underhood or in car.....
> >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
> >tower.
> IME, working on numerous rally cars (some will remember the barrel super HD
> relays with the top screw on fuse), you are compromising the half life of the
> relay leaving in the engine compartment.  All anecdotes aside, there is no
> question that any relay manufacturer would choose a well ventilated "inside"
> application over any underhood.  Any well seasoned rallyist
> or offrorad guy
> is just smiling.
> my .02 arbitriaged thru the peso
> SJ
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Over 70 cars crossed a 40ft wide about 3 -4 deep river this last weekend at STPR.
Nights stages came everyone put there pods with no problems.
Most had them under the hood.


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