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Intermittent shutting off

Printed From: - moto guzzi forum
Category: Technical
Forum Name: General Electrical issues
Forum Description: Not specific to any one group of models.
Printed Date: 17 Nov 2019 at 22:04
Software Version: Web Wiz Forums 12.02 -

Topic: Intermittent shutting off
Posted By: Susto
Subject: Intermittent shutting off
Date Posted: 28 Aug 2018 at 22:37
Hi, I just got my V50 III. It is from 1984 and runs really smoothly. The battery is new.  The issues I am having is that I will sometimes just suddenly shut off. If I then shake the tachometer, the lights wil go on again and as soon as I pressed the starter they went off, then shake again, lights go on, machine starts and then as soon as I engage the 1 st gear it shuts off and then all the procedure again and again till then it finally runs.  Any advice?

Posted By: Mike H
Date Posted: 28 Aug 2018 at 22:42
Wild guess, loose electrical connection in the area of dashboard / handlebars. Ignition switch? Shaking the tacho just makes it connect, but not necessarily anything directly to do with the tacho.

"Chicken nuggets don't dance on a Tuesday."

Posted By: BobV7
Date Posted: 28 Aug 2018 at 22:52
There is a main connector under there which may not be pushed right home. Start there.

V7 Classic Black and gold is the best colour but green & black is nice too!

Posted By: rbt1548
Date Posted: 29 Aug 2018 at 08:54
Originally posted by BobV7 BobV7 wrote:

There is a main connector under there which may not be pushed right home. Start there.
Bob is quite correct, a lot of electrical problems are caused by intermittent connections, while you're fiddling about with the connectors it would be worthwhile giving them all a good clean to ensure you have clean connectors and maybe a protective spray or a coating of petroleum jelly afterwards. Also make sure the earths have a good seat and are straight to metal not to a painted surface.
I don't know what your earthing arrangements are for your bike in the headlight area some just rely on metal to metal through the headstock which is not ideal as that area is/ should be covered in grease which will not give a good earth. I always run separate earth wires from the headlight bowl to a common point on the engine or frame to ensure a good earth. 

2000 Ducati Monster M900
1958 Wife
1965 BSA Lightning Clubman

It wisnae me, a big boy done it and ran away!

"I was so much older then; I'm younger than that now!"

Posted By: Ken-Guzzibear
Date Posted: 29 Aug 2018 at 12:57
What they said .....

The Older i Get, The Better I Was

Posted By: Dave P.
Date Posted: 29 Aug 2018 at 15:18
What Ken said they said !


1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.

Posted By: Susto
Date Posted: 11 Sep 2018 at 10:46
Thanks for all the replies. At the end it were the cables of the ignition switch that were getting loose due to the vibration. I tied them tight together with a zip tie so that there is a certain side pressure on the connectors. This now holds them good in place. 

Posted By: David_M
Date Posted: 11 Sep 2018 at 14:59
My 1983 V50iii did a similar thing, it was not just the connections to the switch but the switch itself. Fitted a new one and cut the old one open to see what had happened. There are four copper studs in the bottom which form the contacts. Mine had three very worn and corroded studs plus a small pile of blue powder where the fourth one should have been. I'm amazed that it managed to work for so long. The placing of the switch makes them prone to filling up with rainwater.

LM V, V50 iii

Posted By: Mike H
Date Posted: 11 Sep 2018 at 19:39


"Chicken nuggets don't dance on a Tuesday."

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