Skip to main content
Topic: Rev counter issues (Read 123 times) previous topic - next topic

Rev counter issues

Hey people, wondering if anyone here can help with a wiring question on this topic.


my mk2 started life as a petrol engine, been coverted to a diesel, the one issue that bugs me a lot is the fact my rev counter doesnt work, while at the mot station, the tester put this unit across the battery an got a read out of the revs. So i find my self wanting to address this issue again.

now from what i see diesel engines get there pulse from the alternator, an thats how the rev counter works. Right ?

a petrol engine gets it from the coil ? is that right ?

anyone shed light on this, becuase then at least i now know what the issue could well be

Re: Rev counter issues

Reply #1
Hi Mate,

That's correct, a diesel alternator usually has an additional "W" output to run a rev counter.
That then goes to A2/6 as per below...
https://www.a2resource.com/electrical/CE2.html

(I'm assuming you have a CE2 setup)
Mk2 Driver
Mk2 Silver 8v
Corrado G60 Turbo
Mk2 Red 8v
Mk2 Grey 16v
Mk2 BBM ABF
Bora 20vt
Mk2 Green VR6
Mk2 Green ABF
Mk2 BBM 20vt
3.2 TT Roadster
Mk2 Red 16v
225 TT Coup
3.2 TT Coup
Mk4 Anniversary
Mk7 Red GTI Performance
Mk2 Red GTI Restoration

Mk2 BBM R32
911 Carrera 4S

Re: Rev counter issues

Reply #2
Hi Mate,

That's correct, a diesel alternator usually has an additional "W" output to run a rev counter.
That then goes to A2/6 as per below...
https://www.a2resource.com/electrical/CE2.html

(I'm assuming you have a CE2 setup)

i do indeed have ce2. thank you so much

monkey, i know your a resident guru, so can i pick your mind on another one, i have ce1 gti 8v, the indiacator green led, glows away gentle while the hazards or indiacators are of, then works fine when one of the above is in use, any ideas

Re: Rev counter issues

Reply #3
No worries mate.

Ohh, while I've not had a CE1 with that issue, I have had a CE2.
It was after a stalk swap, I can't remember if the stalk was faulty or if the connector wasn't pushed in all the way.
Either way, I'd start there, have the connectors in and out and see if that changes anything.
Mk2 Driver
Mk2 Silver 8v
Corrado G60 Turbo
Mk2 Red 8v
Mk2 Grey 16v
Mk2 BBM ABF
Bora 20vt
Mk2 Green VR6
Mk2 Green ABF
Mk2 BBM 20vt
3.2 TT Roadster
Mk2 Red 16v
225 TT Coup
3.2 TT Coup
Mk4 Anniversary
Mk7 Red GTI Performance
Mk2 Red GTI Restoration

Mk2 BBM R32
911 Carrera 4S

Re: Rev counter issues

Reply #4
while late night googling, i came a cross a post, im yet to look at mine, but they stated there indiacators, wasnt working of the stork. turned out to be a blown fuse, so with your ideas, got a few things to work with now