Tacho

[plumbari]

Hi all the tacho on my 89 tdi has a mind of its own under power it is only reading 1,500 rpmsteady at what ever speed you are doing over say 30mph .Asi deaccelerate it goes up and works as normal till it reaches 2,500 rpm then as i gain speed it drops to 1,500rpm .It seems to be running ok just wondered if it was something simple or another rebuild on my alternator as the V8 was acting similar when the alternator packed in ,Any ideas Cheers Dave

[laalmarra]

well the tacho takes its input ffrom the alternator so as the readings you describe are progressive and not fluctuating erratically then you may well be correct to assume an alternator fault.

If it was a tacho fault I would have expected either erratic deflections of the needle or a sluggish response

But it may even be something as simple as a dirty connection on the alternator pickup and the shift of attitude of the vehicle's nose on decceleration makes a good contact for a moment or two and then it returns to the faulty state.

I'd clean up the contact area of the connectors and road test it and see what gives

[plumbari]

Cheers laalmarra Iwill try the connections at the weekend ,Are you local to me Cheers Dave

[laalmarra]

you have a pm

[Skyline]

Make sure your alternator drive belt is tight.

kev

[plumbari]

Cheers Skyline ,laalmarra had to put an electric window motor on the girlfriends car today and wow is it hot here today so will check all the ideas on Tuesday ,Ah a nice day off Cheers Dave

[Skyline]

I had the same problem with mine and the belt was the cause.

Kev

[skyguy]

Dave
When I had the Disco the rev counter wouldnt work at all, The cable was split in two so I scotched it together, If this is no use at least you know which cable to work on.
GARY

[plumbari]

Cheers Gary will check all Tuesday ,Hows the hand and when are we going to see the Disco Cheers Dave

[skyguy]

I Have had my cast off today, the hand is still sore but usable, Have you had the rear quarter welded yet?, let me know when you want to go out to play.
GARY