Good news.
I was waiting for you to ask which way round the Diode goes.
As long as the warning light still come on with the ignition on but the engine
not started then it is the right way round.
For those technical people, the diode should should have the cathode on the
alternator side and the Anode on the warning light side.
Jim
From: flob...@gmail.com
Sent: Sunday, March 19, 2023 4:39 PM
To: Quantum Owners Group
Subject: Re: [Quantum Owners] Usually starting is the problem.......
Found a potted diode with spade connections in the 12v electrics bits and
pieces box and fitted it today. Everything as it should be now. Thought for a
moment that the fault had gone when i moved the car this morning but then
realised i had my foot on the brake pedal when i switched off the ignition;
perhaps this why i had not noticed the problem before.
On Wednesday, March 15, 2023 at 10:12:01 PM UTC flob...@gmail.com wrote:
Sorry Jim, stupid question, you quite clearly say where the diode should go.
On Wednesday, March 15, 2023 at 4:58:04 PM UTC Jim Hearne wrote:
I’m assuming it’s an injection engine.
What is happening is that when you turn the ignition off, power is flowing
from the alternator warning light pin , through the alternator warning light
and supplying power to the ignition / fuel pump relays.
This doesn’t happen on carbed car as the ignition coil is powered directly
from the ignition circuit so when you turn the ignition off you can’t supply
enough power through the ignition warning light to keep the ignition coil
running.
On the injection cars everything is powered from the battery via the relays
so doesn’t need much to keep the relays powered.
There should be a diode in series with the blue alternator warning light
wire near the alternator to stop this problem.
Maybe the diode has gone short or maybe in the past you have always had
something else switched on that draws enough extra power from the ignition feed
circuit to drop the voltage low enough for the relays to open and stop the
engine, heater fan maybe ?
Jim
From: flob...@gmail.com
Sent: Wednesday, March 15, 2023 4:47 PM
To: Quantum Owners Group
Subject: [Quantum Owners] Usually starting is the problem.......
...... but not today, stopping the engine is the problem. Fired up the
saloon today, first time for a few weeks, no problem starting but when i turned
the key to off the engine continued to run and did so on subsequent start/stop
tests. Only clue is ignition warning light comes on when key turned to off.
Checked the switched live feeds and they had 5volts on them with engine running
and key out, enough to hold the relays i use to feed ignition/fuel pump etc. So
where is it coming from? As it's only there when the is running the alternator
looks a good place to start, but how or why can it cause the problem?
Anyone know or have alternative theories/ideas?
Russ
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