An update:

I'm now pretty sure it is the impact/inertia sensor. Power goes to and through the fuse but doesn't get to the pump. Whilst it could be a cable fault, it's unlikely. However I cannot find the damn thing! To get it running I have provided a separate feed. Next step is to get the car in the air to check it's not near the tank. Then I guess it will be off with the dash! The wiring under there is shocking - every time I look I find another in line fuse just hanging around - so I do want to do that as soon as I can. But there is an endless (if shortening) list of things to do - as always.

Regards

On 2022-09-23 14:33, Jim Hearne wrote:

It's bigger than you might think, maybe 50 x 40 x 30 with the red button on the top.

Jim

From: jul...@cityaudioservices.com
Sent: Friday, September 23, 2022 2:30 PM
To: quantumowners@googlegroups.com
Subject: Re: [Quantum Owners] H4 electrics - inertia switch

All

I'm assuming from what I can see on the web it's likely to be a small flattish black box.

Fingers crossed I can find it.

Thanks as ever for the help

On 2022-09-23 14:09, susanandmartin wrote:

As Steve said, near the door (A) pillar is a common place. In a Mondeo (company car) a work colleague had a flat tyre and changed it, then the vehicle wouldn't start - you can imagine he was pretty exasperated. It turned out the inertia switch was in the boot near where he dropped the punctured tyre/wheel!

Martin Scott

Sent from Mail [1] for Windows 10

From: 'Steve Kodź' via Quantum Owners Group
Sent: 23 September 2022 13:41
To: quantumowners@googlegroups.com
Subject: Re: [Quantum Owners] H4 electrics - inertia switch

Julian,

Not sure about a standard location, but I think the wiring would naturally position this in the passenger foot well area. Mine was attached to the chassis door pillar in the passenger foot well.

Regards,
Steve

On 23/09/2022 13:38, jul...@cityaudioservices.com wrote:

Hi

My H4 cut out unexpectedly at the MoT garage after being driven into the brake test equipment which involved the car being grounded! Looking at the circuit diagram there are several potential reasons why this happened, most of which I know how to diagnose and where to look. But one possible potential problem is the impact sensor which is shown in the Haynes manual.

Does anyone know if these are usually refitted in an H4 and if so is there a 'standard' location? It might help me locate it without having to dismantle the entire vehicle. If anyone has a photo of the actual unit I'm looking for, that would also help.

Thanks

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