All you want to do is to cut off both the field current and the battery
power so that the engine won't run on after the switch is thrown and all
electrical sources will be disconnected.
That wiring diagram sounds totally goofy. The big terminals go in the line
from the battery to the positive distribution block--typically your fuse
panel. The small terminals are to interrupt the alternator output.
Some switches come with a resistor, or have one built in internally to
prevent opening the field circuit, which collapses the magnetic field and
turns your alternator into a spark coil. Most alternators can live through
that experience, but it's not good for them. If your switch has a built in
resistor you need to be certain that whichever terminal it is connected to
is the one that goes to your alternator. The resistor is connected from the
small output connector to ground. It needs to have a fairly high resistance
since it's got current flowing whenever the alternator is turning. You could
use about anything that's big enough--perhaps 2000 ohms (I'm guessing). All
it needs to do is bleed off the field current and ensure the voltage doesn't
rise too high.
With three wire alternator, the field wire goes to the small output
connector, the small input connector goes to the battery, as does the big
input connector. The big output connector goes to your distribution block.
The alternator output wire goes to your distribution block so it can feed
back to the battery.
For a one wire it's about the same, but the alternator output wire goes to
the small output connector.
> -----Original Message-----
> From: owner-fot@autox.team.net
> [mailto:owner-fot@autox.team.net] On Behalf Of Chuck Arnold
> Sent: Tuesday, May 23, 2006 12:25 PM
> To: Friends; Triumph
> Subject: [FOT] Distributor wiring help needed
>
> I am completely rewiring my TR250 race car. I have a three
> wire Bosch alternator. I have an emergency cutoff switch.
> According to the switch wiring diagram, the main charging
> feed from the alternator goes to the main "out" terminal on
> the switch. A second wire comes from the switch to my main
> fuse panal [from a different, smaller terminal on the
> switch]. A second alternator wire [Field" wire} also goes to
> this fuse panel. The third alternator wire goes to the
> charging indicator lamp. My problem is, I do not know where
> the other side of this lamp wire should go to.
>
> --
> Chuck Arnold
>
>
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