Speedo and Rev counter inop

This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
T

TheLordJohn

Member
Posts
87
Hello all.

All my auxillary belts are in position and working fine, my fuel gauge and temperature gauge both work fine but my speedo and rev counter are both inoperative.
Can anyone point me in the right direction where to start looking?
Is there a common problem area?

Thanks, Stuart.
 
There should be a wire to the alternator for the Rev Counter. If a new alternater fitted it might not have the tach out?
Speedo, do you have mechancal or electrical? The wiring is from the speed transducer that drives from the transfer gearbox if I remember, check plug and then using a volt meter (long wire into cab) you can see if its pulsing when driving, also check fuses. Or the drive if its mechanical going round (take off to the back of the instrument panel)
 
Cheers mate.

I'd assumed it would be a common fault to cause both to fail rather than two seperate faults. Where are the fuses please?
I'll see if I can see anything obvious on the alternator.

Thanks, Stuart.
 
Would help if you could say what classic you have, year, petrol, diesel etc etc

You should check out the Speed Transducer for the speedo. Its mounted on the left hand side of the chassis v.near the rear engine mount. Ther should be two sections of the speedo cable connected to it, one at each end. Check they are connected and the wiring plug. A bad transducer can affect idle speed.

Fuses!! don't you have a drivers hand book? on later models, in the car, next to heater and ventilation controls just to the left. I don't remember any fused that affect the speedo but its always a good idear to check all fuses. Very Very Very early cars had a fuse box on the engine bulkhead
 
Last edited:
The '89 should be the 2-part mechanical cable, with the transducer in the middle. Probably not relevant, but when mine reached 99,999 miles the speedo stopped working - the speedo itself had jammed attempting to turn that last digit for the first time. I was right up in the north of Scotland and had to drive 500 miles guessing my speed from the rev counter, with the speedo cable disconnected to stop the horrible noise.

So remove the cover from the binnacle, unscrew the drive cable from the speedo, and get somebody to watch the cable as you drive. if the cable end turns, the speedo is dead, if it doesn't the cable is dead.

Thinking back, I don't remember a transducer in my '89 cable, I think it was a single piece... but it was a while ago.
 
Lol. Well I would like to do it sooner, but I am in Scotland this weekend coming, so that pushes it back to the following weekend :(
I shouldn't really have bought his classic as it requires/required A LOT more work than I thought and have time for, but I felt sorry for the thing.

And it sounds the business!!
 
Oldfogey said:
The '89 should be the 2-part mechanical cable, with the transducer in the middle. Probably not relevant, but when mine reached 99,999 miles the speedo stopped working - the speedo itself had jammed attempting to turn that last digit for the first time. I was right up in the north of Scotland and had to drive 500 miles guessing my speed from the rev counter, with the speedo cable disconnected to stop the horrible noise.

So remove the cover from the binnacle, unscrew the drive cable from the speedo, and get somebody to watch the cable as you drive. if the cable end turns, the speedo is dead, if it doesn't the cable is dead.

Thinking back, I don't remember a transducer in my '89 cable, I think it was a single piece... but it was a while ago.
Click to expand...

I have the same problem cable spins around but my speedo has gone dead i'm still waiting for a replacement on the bay :(
 
You must log in or register to reply here.

Similar threads

RogueV8
Temperature gauge jumps to HOT when I turn the key (prior to turning over)
Replies
2
Views
664
tottot
tottot
Z
Electric WTF have I done?
Replies
17
Views
2K
Stanleysteamer
Stanleysteamer
84ninety
Rev Counter for 4 cylinder petrol
Replies
2
Views
891
84ninety
84ninety
jwrrc
Classic Rev counter / tacho has stopped working
2
Replies
26
Views
3K
jwrrc
jwrrc
KISSMYAURA
SOLD DEFENDER TD5 Rev Counter / Tachometer
Replies
0
Views
963
KISSMYAURA
KISSMYAURA
Back
Top