Jonas:
As originally wired, the Healey's battery cut off switch grounds the
ignition through the white/black wire that runs directly through the main
wiring harness from the switch to the coil. This was done to prevent the
engine running on the generator - a possibility when the switch was switched
to the off position with the engine running. (We can thank the late Norman
Nock for this explanation many years ago). The anti-theft feature is an
additional benefit - such that it is.
In a non-running car with no ignition, first check for the possibility that
the wire is grounded at the switch - disconnect it and tape the exposed
wire. If the engine then runs, there is a problem at the switch, or with
the switch itself. If no luck there, disconnect the white/black wire at the
coil. If the engine then runs, the wire is grounded somewhere in the wiring
harness - maybe at a frayed part in the harness underneath the car - it's
been known to happen in a Healey!
If still no luck, the problem is elsewhere.
Earl Kagna
Victoria, B.C.
BJ8, BT7 tri-carb
-----Original Message-----
From: Jonas Payne
Sent: Friday, May 11, 2012 9:38 AM
To: 'Derek Job' ; 'Forum'
Subject: [Healeys] Healey "Security" Circuit
When the switch in the trunk is flipped, is it supposed to be interrupting
the
black white ground or is it supposed to be grounding it out?
The power will go to ground via the path of least resistance, so my theory
is
that an ignition system (capacitor, spark plug, etc.) has lots of
resistance,
so if the switch in the trunk is "on" then the black/white wire is not
grounded. and when "off" the coil will ground itself out and no power will
be
making it to the dist. Right?
If that's the case, I can isolate this variable in my not working ignition
by
disconnecting it in the trunk and making sure it isn't grounded.
The wiring diagram does not indicate which side of the switch the black and
white wire is actually on in the trunk.
If not as described above, is it a "flow" item similar to the ignition light
(charge/discharge) indicator? And if so, How do I then Isolate it.
Jonas Payne
PBR
Cell: (702) 358-5084
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