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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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