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 -- -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to quantumowners@googlegroups.com To unsubscribe from this group, send email to quantumowners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). --- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to quantumowners+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/quantumowners/9b5b5004-532d-44b1-8fac-76c2300f7ae1n%40googlegroups.com. -- -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to quantumowners@googlegroups.com To unsubscribe from this group, send email to quantumowners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). --- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to quantumowners+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/quantumowners/E65B0D1F21CC496DB3476B1B63C70B0A%40JimQuad.
