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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Dec 2009
Posts: 37,434 Likes: 978
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,434 Likes: 978 |
HI Guys,
Only had my 2015 Plus 4 for a few months and never heard of this "Inertia Switch". My handbook says it's a Red Exclamation Mark and is only fitted to a Plus 8, so no help there.
Is it something fitted to older models of the Plus 4?
Regards
Mark I understand it to have been a legal requirement for a great number of years it's to cut the fuel supply in the event of an impact to cease fuelling a possible fire situation. They are sited in my experience under the bonnet on the passenger side near the firewall and are around 2" square with two electrical connections and the front of the switch has a rubber covered reset button.
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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Joined: Mar 2020
Posts: 177 Likes: 12
L - Learner Plates On
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L - Learner Plates On
Joined: Mar 2020
Posts: 177 Likes: 12 |
I have something fitting the description, see pic. ![[Linked Image]](https://www.tm-img.com/images/2020/06/24/Reset-Switch.jpg) Learned something today, Thanks
Mark
2015 +4 Ferrari Le Mans Blue
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Joined: Dec 2009
Posts: 37,434 Likes: 978
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,434 Likes: 978 |
Well spotted  Here is a diagram covering my Plus 8 but I notice your car has the same colour coding.
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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Joined: Jul 2007
Posts: 27,816 Likes: 749
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,816 Likes: 749 |
Yes it should be on the bulk head by passenger side above the wiper motor. In this photo where I am siphoning the header tank to change out the plastic t piece for a SiFab metal one it is the black square behind the hose as it enters the tank ![[Linked Image]](https://www.tm-img.com/images/2017/12/04/20171204_092901.jpg)
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Nov 2018
Posts: 103
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Nov 2018
Posts: 103 |
On my 94 plus 4 it’s day glow orange. First thing that visually hits you When you open the bonnet
Tony
1994 Connaught Green Plus 4
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Joined: Nov 2015
Posts: 8,684 Likes: 493
Just barreling along Needs to Get Out More!
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Just barreling along Needs to Get Out More!
Joined: Nov 2015
Posts: 8,684 Likes: 493 |
Yes it should be on the bulk head by passenger side above the wiper motor. In this photo where I am siphoning the header tank to change out the plastic t piece for a SiFab metal one it is the black square behind the hose as it enters the tank Just noticed your belt guard, my late 2004 S1 never had one fitted
Jon M
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Joined: Jul 2007
Posts: 27,816 Likes: 749
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,816 Likes: 749 |
Well mine had no air filter from new. Obviously MMC rationing parts  It is not much of a guard. In a factory it wouldn't pass the regs but it is better than nothing.
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Nov 2015
Posts: 8,684 Likes: 493
Just barreling along Needs to Get Out More!
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Just barreling along Needs to Get Out More!
Joined: Nov 2015
Posts: 8,684 Likes: 493 |
Well mine had no air filter from new. Obviously MMC rationing parts It is not much of a guard. In a factory it wouldn't pass the regs but it is better than nothing. Mine had the big GRP air scoop completely missing
Jon M
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Joined: Feb 2020
Posts: 586 Likes: 21
Talk Morgan Regular
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Talk Morgan Regular
Joined: Feb 2020
Posts: 586 Likes: 21 |
Its very useful if you need to prime your oil pump in the event of sudden oil loss. The AA man tapped it with a spanner to activate so the engine turns over without firing; useful tip maybe🤔 Thanks for that Treesurveyor I'll use that at next Lub oil change A lot easier than removing the rotor arm. I'm glad you had your leakage now I'm not paranoid about it, but have discovered that trying to chalkpaint the sump plug results in the mark slipping (Not sticking on the sump body) , so find myself constantly on my knees checking for weepage  
"DOT" 35th Anniversary Edition Plus 8- family owned from new. Rolls Royce Pewter.
06 Saab 93
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Joined: Dec 2009
Posts: 37,434 Likes: 978
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,434 Likes: 978 |
Its very useful if you need to prime your oil pump in the event of sudden oil loss. The AA man tapped it with a spanner to activate so the engine turns over without firing; useful tip maybe🤔 Thanks for that Treesurveyor I'll use that at next Lub oil change A lot easier than removing the rotor arm. I'm glad you had your leakage now I'm not paranoid about it, but have discovered that trying to chalkpaint the sump plug results in the mark slipping (Not sticking on the sump body) , so find myself constantly on my knees checking for weepage I understand that, I put a smear of Blue Hylomar on the plug threads. Gearbox and diff as well.
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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