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Re: [ST] headlight relay * CORRECTION *



I wouldn't necessarily take everything you read in a Haynes manual as
gospel, but in this case I tend to believe it.

;-)



----- Original Message ----- 
From: "Enrico Schuerrer" <enrico@xxxxxx>
To: <ST@xxxxxxxxxxxxxx>
Sent: Tuesday, November 15, 2005 11:34 AM
Subject: Re: [ST] headlight relay * CORRECTION *


> >From the Haynes service & repair manual:
>
> neither the main beam nor the dip beam relays are with diodes.
>
> Enrico
> -- 
> '00 ST BlueBelle
> Vienna, Austria
>
> ----- Original Message ----- 
> From: "Chris Harwood" <Chris@xxxxxxxxxxxxxxxxxx>
> To: <ST@xxxxxxxxxxxxxx>
> Sent: Tuesday, November 15, 2005 8:14 PM
> Subject: Re: [ST] headlight relay * CORRECTION *
>
>
> | The diode would not be for spark suppression.  They go across the
coil
> | to sink the back-emf when the relay is powered off.  If a transistor
is
> | driving it this prevents the driver being destroyed.
> |
> | However, not all devices that look like relays are relays these
days.
> | Some have time delay components in them etc. for self-cancelling
> | indicators, rear-screen heaters on cars and the like.
> |
> | I would strongly recommend that you don't plug anything new into the
> | sockets unless you've buzzed all the device pins out with a
multimeter
> | or confirmed by the image on the side that it is the same
configuration
> | as the good one you have.
> |
> | Chris Harwood
> | 00 RS
> |
> | >>> Neil.Lindsey@xxxxxxx 15/11/2005 19:01:24 >>>
> | 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
> | > Send list posts to ST@xxxxxxxxxxxxxx
> | > Change your list options at www.Triumphnet.com
> | >
> |
> |
> |
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