General 1998 2.5 TD engine momentarily cutting out

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General 1998 2.5 TD engine momentarily cutting out

Crossingkeeper

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Hi Folks, please don't think I've just joined to get help with a problem; I've been reading the forum for some months, it's even bookmarked honestly!

Anyway after two reasonably trouble free years (apart from rusty brakepipes:mad:) the engine cut out twice on a recent run. Each time it was exactly as if I had turned the ignition off i.e. indicators stopped working & of course engine stopped, fortunately both times the situation was awkward but not dangerous. Both times power magically restored after 3/4 seconds so engine could be restarted.

I haven't dared go out since but have played with the van in the yard. The fault has reccurred but frustratingly corrects itself in seconds before I can do any sort of diagnosis. The only clue is that indicators are in use when it happens; however the hazards work when the indicators go out so I expect that it is the higher current draw that trips the fault rather than a problem with the indicator circuit.

I have done the obvious things, checked wiring & connector blocks to the ignition switch, checked wiring and connections to fuse block, especially at fuse No. 1 which protects indicators & code reader, wriggled all wiring, studied the after market alarm (Cobra 7777) suspiciously and done internet searches (my queries on two other forums under my normal username of Steptoe come up near the top of the page, so it seems it is not a common problem). I am now almost desperate enough to now go and buy an expensive new ignition switch, even though I don't think this is the problem, just hoping someone on here has had a similar problem and sorted it:confused:
 
Obviously no-one has had this problem before.....so will post an update and solution for future searches.

After some hours fruitlessly searching under the dashboard, the fault re-appeared as I started the engine for a road test run, mercifully this time it didn't disappear, so I was able to trace it with a meter.

The problem was a failed spade connector in a 4-way 'mother of all' connector block under the dashboard to the right of the steering wheel. This wire feeds the battery supply to the ignition switch, hence the failure of all ignition controlled circuits.
 
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