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Discussion Starter · #1 ·
My rev counter instantly stopped working ie no signs of impending failure. I fitted a spare instrument pack (found on eBay) but that doesn't work either. Both tachos twitch very slightly when ignition key turned so they are seemingly 'live' but obviously not getting a signal from the engine. As far as I can make out it is a thin dark green wire that provides the missing signal, where does it connect to? It just seems to disappear into the loom. Is there a relay in the circuit that could have failed?

Any pointers much appreciated.

Clive
 

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im not 100% sure if theres a relay in the system or not, but i doubt it very much. usually the pulsed feed is fed from the ignition coil and the green wire will eventually end up there, on the positive side, from memory. when wiring from scratch theres a pulsed feed from the coil, an ignition on permanent live, and an earth.

it could be worth checking the connections on the back of the instrument cluster too as some of these were prone to poor connections etc.
 

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Discussion Starter · #3 ·
Thanks for the reply Pete. The original revcounter has been soldered in at some point, the replacement instrument pack isn't soldered , both slightly twitch when ignition turned on then nothing. The ignition-on permanent live is err, live! The earth appears to have continuity, just nothing from the pulsed feed, and I can't see a similar thickness/green colour wire anywhere near the coil to check continuity. I could run a new wire from the coil directly to the revcounter hopefully without wrecking anything and see what happens! I'll have another look today....... I'll keep ya posted:)

Clive
 

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im not entirely sure (its been a LONG time since i worked with one) BUT i seem to recall some connectors in the wiring at/next to the coil on some mk4s which may have been something to do with the rev counter. it cant be much more than a simple tee-off the wiring sort of affair as it doesnt have an ECU of any sort, nor does it have a crank sensor.

a wire straight to the coil should be fine (I'm almost certain its to the + side but its over 20 years since ive done one!) and just as an aside, do check that the rev counter has a 'redline' on it. the ones that don't have a redline are diesel ones!
 

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Discussion Starter · #5 ·
Thank you for replies, upon further investigation it seems I need the suppressor that sits near the coil on the nearside wing. It is a small black block 25mm x 8mm x 14mm with one red and one green wire coming out of it with a dual bullet connector type plug (one male and one female terminal. Anyone have any idea where I could get one, new or old. My local scrapyards (nr Fareham) don't seem to have Escorts or if they do they won't let me in - bizarre!!
 
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