Thanks for the explanation Nolan .
Kind regards .
Chris de Wet .
TSCC ( SA ) membership number : 356 .
'56 TR 3 ( TS 10795 ) + '64 Spitfire 4 Mk 1 ( FC 25680 ) .
PO Box 472 , Ifafi , 0260 , South Africa .
Telephone : 012-3398071 ( office ) or 012-2591129 ( home ) .
Cellphone : 083 9989744 .
Projects : '62 Herald 1200 Coupe , '65 Herald 12/50 ( convertible ) ,
'63 Spitfire 4 Mk 1 , '64 Spitfire 4 Mk 1 , '66 Spitfire 4 Mk 2 .
-----Original Message-----
From: Nolan Penney [mailto:npenney@mde.state.md.us]
Sent: Friday, February 16, 2001 8:34 PM
To: spitfires@autox.team.net; hutton@evansville.net
Subject: Re: Overdrive tranny question
To add on to what Joe said, there actually is a reason to use a relay.
The starter circuit is an excellent example. That huge battery cable runs
over to a relay and then down to the starter motor. That starter relay (or
solenoid in some cases) is controlled by a little wire that runs up to the
ignition switch. You could actually eliminate the relay and run that huge
wire up into the dashboard, to a massive switch, and down to the starter
motor. Pretty clearly, this wouldn't be a good thing. You'd have huge
wires under the dashboard, bulky switches, lots more weight, and voltage
drop problems with the long wire runs.
Other circuits take advantage of this, just not as dramatically. Things
that take a lot of current benefit from the use of relays. Headlights, fuel
pumps, overdrive solenoids, etc. The benefit varies. I kinda doubt the
overdrive relay gains much. But a headlight relay can give dramatic results
in illumination improvement by reducing voltage drop.
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