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Re: Speedo Fun

To: REwald9535@aol.com
Subject: Re: Speedo Fun
From: Trevor Boicey <tboicey@brit.ca>
Date: Mon, 14 Dec 1998 23:59:25 -0500
REwald9535@aol.com wrote:
> I teach automotive electronics to technicians
> and I do not recall ever seeing over one-one-hundredth of a volt drop in any
> wiring harness EXCLUDING connectors, switches, or starter circuit.

  Heheheh spend some time on this list, my friend. ;>

  Well, any MG is wired with a LOT of connectors, especially
in that area.

  These are connections that OFTEN develop so much resistance that
the device actually ceases to work, although some current still
flows.

  The classic example is a turn signal not flashing. This
is a situation where a connection, almost always a ground,
develops enough resistance that the current through the
circuit still flows enough for the light, but not enough
to do a flasher cycle.

  This happens regularily, and is WAY over the one-one-hundredth
of a volt you claim to be the most you beleive could exist.

  Spend some time around here my friend, and you will learn
the true evil of LUCAS. ;>  
  
> You say that as a bulb fails there will be a little more voltage to each bulb,
> and that LUCAS connectors might make that a lot more.  There is no connector
> made by LUCAS or anybody else that can increase the voltage over what the
> source voltage is.  End of story. <G>

  Please refer to the original discussion, this circuit is
ALWAYS running over the "source" voltage the bulbs are
designed for. These are 7.5V bulbs in a 12V circuit. What changes
is HOW MUCH over the source voltage. 

  It is not unreasonable to beleive that, when already considerably
over the designed voltage, a few tenths of a volt might be the
difference between a bright filament and a dead filament.


-- 
Trevor Boicey, P. Eng.
Ottawa, Canada, tboicey@brit.ca
ICQ #17432933 http://www.brit.ca/~tboicey/

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