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Re: [ST] headlight relay * CORRECTION *



You're right about relays being relatively simple, but if Marc had used
a normally-closed relay instead of a normally-open variety the second
low-beam would not have worked at all when the key was turned on with
the dip switch in the low position.

As for the comment about the diode, it is true that arc suppression is
likely to be it's function, but there may more to it than that,
particularly if it is associated with the input side, and not the load
side.  I'd need to see exactly where it is placed in the relay and to
study the schematic a bit more to comment further.

There is also the possibility that the one than Marc tried is simply
unable to handle the to current drawn by a high beam circuit, or perhaps
even simply defective (though not likely).  If, for example, the
contacts on the output side are overly resistive, the relay could get
quite warm. Normally I would have expected the second low beam headlight
to be noticeably dimmer, but maybe not.

Unless, an EXACT replacement for the OEM relay can be identified FOR
SURE, I don't think it's worth the effort.  The relay should be good for
the life of the bike.



----- Original Message ----- 
From: "Rick & Joyce" <rnjwes@xxxxxxxxxxx>
To: <ST@xxxxxxxxxxxxxx>
Sent: Tuesday, November 15, 2005 6:10 AM
Subject: Re: [ST] headlight relay * CORRECTION *


> First of all, I was wrong about the Bosch 0332 014 150 relay.
> According to: http://tinyurl.com/9mc77 , it's a normally closed relay
> with 2 output terminals. That means you could hook it up so current
> flows when the switching current is off - not a good thing for a
> headlight circuit!  A better Bosch application would be 0332 014 019
> (12v, 30a, 4-terminal, normally open contacts - no room for error.
>
> So here's a corrected headlight relay list:
> Bosch 0332 014 019
> Hella 4RA 035 510 111
> Wehrle 20 200100
> Italamec 562.10
> According to the same website, all the above are interchangeable.
> We also have Emile's Hella 4RA 007 791-021.
>
>
> Simplistically, a relay is a remotely-controlled electrical switch.
> The relay's protection diode (think of it as an electronic
> check-valve) prevents circuit-damaging electrical spikes when the
> relay is switched.
>
> Let me add to Neil's response that you might check the relay amperage
> rating too.  The Bosch one I listed is rated for 30 amps - more than
> adequate for the 4-5 amp draw of a 55w low beam.
>
> FYI, here's a nice little tutorial on relays:
> http://www.kpsec.freeuk.com/components/relay.htm
>
> --
> Rick in Oregon
> '01 Sprint ST
>
> _______________________________________________
> Triumph Sprint ST/RS mailing list
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>



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