Thread: Tacho not working

Yes the tacho is driven by the alternator,

There is usually a male spade connecter in a rectangular window on the back face of the alternator. Even Bosch ones, if not you need to go to an auto elect and get him to fit a tap wire for it.

Diana

Originally Posted by flyreels

Hi, I have a 93 Discovery 3.5 V8 and the tacho doesn't work. The white wire is off the back of the alternator and I am not sure where it goes - as it has a spade fitting and there is nothing on the back of the alternator to suggest where it should go, so maybe its an aftermarket alternator? Is a Bosch 70 amp, I will include a picture and hopefully someone where to fit the white wire to get the tacho going again.

Thanks, Peter

Usually only carb Falcon XE-XF vintage Bosch alternators have the correct tapping. To do it yourself you will need to remove the regulator, then the back cover. Solder a wire to any one of the 3 field wire solder points, run it outside and you have a tacho output.

Originally Posted by bee utey

Usually only carb Falcon XE-XF vintage Bosch alternators have the correct tapping. To do it yourself you will need to remove the regulator, then the back cover. Solder a wire to any one of the 3 field wire solder points, run it outside and you have a tacho output.

Hi thanks for that. thats exactly what I was looking for. So the one thats on it then is not original? what brand did they come out with and how many amps are they?
Thanks

Originally Posted by flyreels

Hi thanks for that. thats exactly what I was looking for. So the one thats on it then is not original? what brand did they come out with and how many amps are they?
Thanks

Never seen a Bosch alternator on a Landy unless I put it there. Yours should have had either a Magneti Marelli or a Lucas? around 100amp. Usually expensive to fix.

Bosch aftermarket alternators go up to 130amp, the one in your pic could be off anything, only a sparky would know for sure. I would guess it a replacement alternator as it says made in Spain, this is after Bosch Australia stopped making this style of alternator here for Oz production cars.

I have mixed and matched bits of Bosch alternators for many years, I used to keep a XE-XF alternator spare somewhere around as they are the quickest to adapt to a rover V8. The guts of a bigger output alternator than 70A can easily be fitted to your case if it has the best mountings.