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RE: [TR] Testing the TR3's switch and several wires

To: "'Paul Dorsey'" <dorpaul@negia.net>, "'list Triumph'"
Subject: RE: [TR] Testing the TR3's switch and several wires
From: "Randall" <tr3driver@ca.rr.com>
Date: Sun, 3 Jun 2007 22:50:19 -0700
> The schematic in the manual shows 3 terminals on the starter solenoid:
> (1.)the small red and white wire goes to the uppermost 
> terminal (as shown in the manual), (2.)the neg. battery cable 
> goes to the smaller terminal which is in the middle of the 
> solenoid (but on the edge), (3.) and the starter motor cable 
> goes to the bottom terminal.

Well, you've already found that's wrong ... which points up a common problem
when relying on the manuals to show everything (like solenoid terminals) in
just the right physical location.  They don't !  BTW, that's an early wiring
diagram, the later ones that are more correct for your car were updated to
be less wrong (but still not totally correct ... the main solenoid terminals
are shown side-by-side).

> HOWEVER, THE 
> SCHEMATIC DIAGRAM SHOWS THAT A BROWN WIRE GOES TO THE SAME 
> SOLENOID TERMINAL AS THE BATTERY'S NEGATIVE- HOWEVER, I'VE 
> NOT CONNECTED THE BROWN WIRE (it goes to the ammeter which is 
> unnecessary for this test, BUT, is this my problem????

The starter pushbutton has to get power from somewhere.  Normally, that's
from the "white" circuit(wire).  But where does the white wire get power ?
It comes through the ignition switch (so the switch must be on), through the
control box, and through the ammeter.  So unless you've provided some other
source of power, all those things much be wired up.

> Please just help me 
> with the problem as stated above.

One approach would be to leave the temporary jumper between the red/white
and white wires (as you've already done), and check the voltages directly at
the starter solenoid.  You should find 12v between the small terminal and
the case of the solenoid.  If not, then either the case is not grounded (a
requirement) or there is no power reaching the terminal.

If there is 12v between the small terminal and the case, then check the
voltage between the two big terminals.  It should be zero.  If not, likely
the solenoid itself is bad.

If there is 0v between the two big terminals, then check the voltage from
one big terminal to ground.  There should be 12v here.  If not, then there
is a problem with the big cable to the battery, or the battery itself, or on
the ground side of the battery.

If you find 12v from the big terminal to ground (doesn't matter which one,
since you've already checked above that there is no voltage between the two
big terminals); then check the voltage from the big (only) terminal on the
starter to ground.  If no voltage here, then there is a problem with the
cable from the solenoid to the starter.

That should at least get you closer ... let us know what you find.

Randall


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