Re: converting 12 volts to 4 volts
- From: Martin Griffith <mart_in_medina@xxxxxxxx>
- Date: Fri, 30 May 2008 14:52:10 +0200
On Fri, 30 May 2008 11:01:21 +0100 (BST), in
rec.arts.movies.production.sound "Dave Liquorice"
<allsortsnotthisbit@xxxxxxxxxxx> wrote:
On Thu, 29 May 2008 11:30:02 +0200, Martin Griffith wrote:
the motorcycle has a starter safety relay ( which basically stops
the starter motor from reengaging once the engine has started)
which is activated by 4 volts from the old style alternator
Is it just a small relay that breaks the feed to the starter solenoid or
is it another solenoid that physically prevents the starter engaging?
How much current do you need?
You could just use a resistor, and ohms law
This is the method I would try first. Measure the DC resistance of the
relay coil (if it's not marked) and use 13 or 14v (the voltage from the
alternator when running will be higher than the nominal battery voltage)
to work out the value and wattage of a required series resistor. I doubt
that the voltage is all that critical just so long as there is enough
current to reliably operate the relay.
Just make the series R 3 times the relay resistance
martin
.
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