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 Intermittent ignition cut out

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T O P I C    R E V I E W
GeoffCPosted - 22 Mar 2021 : 12:45:30
I'm running out of ideas here so any further suggestions welcome! My Sonett has recently developed an annoying ignition cut out problem. It's just like I've turned the ignition off and then back on again. It doesn't last long but doesn't fill me with confidence to stray too far from home! I have checked coil leads, back of the alternator and the ignition switch but found no loose connections. I have bought new plug leads and that's made no difference either. I have an Acuspark electronic ignition which has been on for several years so am wondering whether it's that as the car doesn't start as instantly as when I first fitted it. So my plan is to buy a new one and hope that solves the problem (I no longer have the points and condenser so can't try that), however if anybody has any other ideas that would help or experienced similar would be great to hear them. I've ruled out fuel as it's instantaneous and the rev counter cuts instantly as well.
15   L A T E S T    R E P L I E S    (Newest First)
andydeans3Posted - 25 May 2021 : 15:49:20
quote:
Originally posted by GeoffC
Andy, the Sonett doesn't have the big relay like the 96 but as mentioned in my last post has 3 small ones. I'm sure you are right though the headlights will not be directly wired through the switch. In the case of the Sonett III the switch is a simple micro-switch triggered by pulling the long lever which operates a bell crank to pop up the headlights. That was something else I had to replace on mine.


Geoff.
Ah, I see. I know nowt about Sonetts!

1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
EdinburghJoePosted - 25 May 2021 : 12:01:27
I'm pleased to be corrected - thanks all (and it's good news for the ignition switch too if it's not having to pass all that current!)
GeoffCPosted - 24 May 2021 : 23:54:55
Andy, the Sonett doesn't have the big relay like the 96 but as mentioned in my last post has 3 small ones. I'm sure you are right though the headlights will not be directly wired through the switch. In the case of the Sonett III the switch is a simple micro-switch triggered by pulling the long lever which operates a bell crank to pop up the headlights. That was something else I had to replace on mine.
andydeans3Posted - 24 May 2021 : 20:52:46
Joe.
Headlights are most definitely switched through the large silver relay on the bulkhead. When you flick the light switch, you can hear the relay clicking. Put your hand on it, get someone to switch the lights on, and you can feel the relay operating.
If you have spotlights on your car make sure that they are also switched through a separate relay. Never put all that current through the switch, or the existing relay.
Andy

1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
GeoffCPosted - 24 May 2021 : 19:10:20
There's 3 relays on the Sonett so I assumed one was for main beam, one for dip and the other for the auxiliaries. When I fitted my extra Hella driving lights I had to replace one of the relays. Couldn't get another round hella relay like the originals so I got a plastic one and it fitted nicely in the old metal case of the original. I was pleased with that!
EdinburghJoePosted - 24 May 2021 : 14:25:25
Interesting I just assumed that the relay was to control the full beam because the full beam selector on the indicator stalk is not a conventional switch, and you can tell its a relay because when you activate it you hear the mechanical clunk it makes. The actual lights switch is a conventional switch, and so I always thought it just controlled the lights directly- theres no clunking when the lights go on and off.

I must admit Ive always just assumed this and never checked it (never had need to) so I could be just plain wrong.

Joe.
mellePosted - 18 May 2021 : 18:06:40
That's what I was thinking, the headlights are switched through a relay.

www.saabv4.com
GeoffCPosted - 18 May 2021 : 17:58:12
Shouldn't be too higher current going through the ignition switch should there?
mellePosted - 18 May 2021 : 14:14:02
quote:
Originally posted by EdinburghJoe
I do take care of the ignition switch by switching the headlights on after starting the engine, and off before stopping it. That way the ignition switch itself is never making or breaking the lighting circuit, which should keep any sparking to the light switch rather than the ignition switch.
I was thinking about this, but I don't think I understand it. What might cause any potential sparking?

www.saabv4.com
GeoffCPosted - 18 May 2021 : 12:21:06
Thanks Joe hopefully it will behave itself, time will tell!
EdinburghJoePosted - 18 May 2021 : 11:12:27
Fingers crossed it works - these intermittent problems are real s*ds to sort out - you never know if you've fixed it, or it's just waiting for the right awkward / dangerous point to fail again.

I do take care of the ignition switch by switching the headlights on after starting the engine, and off before stopping it. That way the ignition switch itself is never making or breaking the lighting circuit, which should keep any sparking to the light switch rather than the ignition switch.

Good luck!

Joe
GeoffCPosted - 17 May 2021 : 12:33:00
No problem Melle it probably needed doing anyway.
mellePosted - 17 May 2021 : 08:37:39
Glad to hear this seems fixed! Apologies for sending you down a dead end with the earth wire...

www.saabv4.com
GeoffCPosted - 16 May 2021 : 17:44:35
Well looks like Joe guessed the solution. I took the ignition switch off and cleaned it as specified by Joe. Took it out this afternoon between downpours and it never missed a beat! So fingers crossed I'm hoping that will solve the problem, will try a longer run if the rain stops long enough - my back window leaks!
Thanks Joe.

Apologies for the delay we have been up to Scotland for a few days as we missed out on our annual Mull visit last year. Just love the roads, the wildlife and the stunning scenery on that island. First went there servicing for a 96 on the Mull Stages in 2008 and have been back many times since. The whisky is good too!!!!
GeoffCPosted - 17 Apr 2021 : 09:56:54
Thanks Joe, I'll certainly try that. May be a couple of weeks before I can get back to it but will report back when done.

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