Engine not switching off?

[Oneball]

Just a minispares S dizzy with points..
D

Is the alternator wired correctly? You’ve not got the positive and warning light wires muddled?

Is the ignition light on when running or when you turn it off?

[Polarsilver]

Dave , there is a spare Alternator here if you want to trial fit it to Pickup & see if that is your issue..or maybe trial fit an added Diode in the warning light supply to see if that solves the problem as others on here have suggested it could be a Diode issue .. or wait till Monday & talk to Autosparts & ask if they fit a Diode in their Alternator conversion Harness?

[Oneball]

As I understand it you only need a diode in the light circuit if you’ve got certain types of electronic ignition as you can get a small voltage in the circuit, but that voltage is too small to work a points based ignition system.

I’ve also got a known good alternator as my car is in bits at the mo, if Worcester is nearer.

[kit of bits]

Dave , there is a spare Alternator here if you want to trial fit it to Pickup & see if that is your issue..or maybe trial fit an added Diode in the warning light supply to see if that solves the problem as others on here have suggested it could be a Diode issue .. or wait till Monday & talk to Autosparts & ask if they fit a Diode in their Alternator conversion Harness?

Thanks for the offer I’m sure it’s the only thing it can be now I’ll probably buy one tomorrow..
D

[kit of bits]

As I understand it you only need a diode in the light circuit if you’ve got certain types of electronic ignition as you can get a small voltage in the circuit, but that voltage is too small to work a points based ignition system.

I’ve also got a known good alternator as my car is in bits at the mo, if Worcester is nearer.

Thanks for the advice and offer, I’ll probably buy one at bingley tomorrow, if not Norman is 15 minutes away..
D

[kit of bits]

That’s a new alternator fitted and still running
I’m sure it’s something simple!
Dave..

[Rubber Sprung]

Does the engine stop if turn the head lights on ?

[kit of bits]

I think the problem is sorted.
Two of the dash light bulbs were old and a bit manky one being the ignition light bulb ..
I was working on the principal of original parts are better than new reproduction..
I’ve change all the dash light bulbs for a new matching set (OCD) I did a quick light check and all works properly and engine switches off!
I’m still not 100% sure if a bulb could have caused the problem but for some reason it’s working as it should!
Thank you all for your input..
D

[Spider]

If the warning lamp for the Alternator is too high in wattage or there's a short across it or a lot of crud in the lamp base, it will do just this.

The Terminal on the Alternator for the Lamp (IND) is essentially another charging output, though, quite limited in current. With many if you try to draw too much it will burn out the regulator, though some can have a reasonable output. It's the resistance of the lamp that stops it from running on. The last thing I'll mention here is that the coil you are using must have a somewhat high primary (12 volt winding) resistance. There's nothing wrong with having that, it clearly does the job, but I suspect it maybe a low output coil.

[Oneball]

Great result.

I once spent ages trying to sort out an indicator fault only to find I’d put the wrong wattage bulb in.

[Peter Laidler]

Clever bit of lateral thinking there Spider and similar from Oneball regarding the bulbs.

Talking of the old Lucas bulbs and the hundreds of variables....... I bought a BIG job lot of Lucas bulbs for £25 from my local garage that was closing down (now a small block of flats!). They had all been mixed up, wrong boxes with most of the markings blurred, big and small, obsolete. There were sooooooo many variations of side pegs, alignment filaments, wattages, voltages etc etc. It took weeks to eventually get through testing and sorting them. Kept a couple of sets for our family cars and sold the rest on as a job-lot......, sorted this time...... to a trader at Beaulieu a few years ago!