Noticed a weird issue with my speedo yesterday that I don't think it has done before.

 

Every time I got to a certain speed, the speedo dropped to zero. When I went below the speed it had stopped at, it starts working again.

 

As background, I bought a new set of clocks a month ago but the speedo would stop working intermittently (and the mileage stopped as well). As a JDM I had a KMH to MPH converter on the old clocks, I wired the new clock the same as the old ones. After checking the wires were all OK, I swapped the converter to the one that came with the new clocks and tried again, same problem and then the clocks stopped altogether.

 

I swapped the old clocks back, but left in the converter from the new clocks.

 

When I had the new clocks, the converter was wired to different screws on the back of the clocks so is this the problem?

 

Anyone had this issue?

Many clocks suffer at some point with one issue or another involving the speedo or oddometer.

A duff convertor or insufficient contact on the screws is one cause. The screws have a wax like coating which needs to be cleaned to make a good contact. The wiring should be standard 12+, 12- 2p for signal, obviously green/yellow spliced which is the orignal signal in.

 

Another problem is dry joints on the speedo board itself, not the plastic film on the back of the dash, but around the R10 resistor tracks on the board. You will need to take the clocks apart and take out the speedo dial removing 6 screws for the turbo and speedo gauge and one at the top (100k).

Resolder the tracks with new solder and hopefully job done.

 

http://pexcom.com.au/z32cms/e107_plugins/content/content.php?content.321

Edited October 14, 201213 yr by groover

Why don't you get uk clocks ?

Why don't you get uk clocks ?

 

These were cheap. I may well end up buying a UK set (if I see any for sale, they all seem to be Jap ones).

The real curious bit is that the speedo now fails at exactly the same speed every time now and comes back on when I drop to that speed.

 

- - - Updated - - -

 

Many clocks suffer at some point with one issue or another involving the speedo or oddometer.

A duff convertor or insufficient contact on the screws is one cause. The screws have a wax like coating which needs to be cleaned to make a good contact. The wiring should be standard 12+, 12- 2p for signal, obviously green/yellow spliced which is the orignal signal in.

 

Another problem is dry joints on the speedo board itself, not the plastic film on the back of the dash, but around the R10 resistor tracks on the board. You will need to take the clocks apart and take out the speedo dial removing 6 screws for the turbo and speedo gauge and one at the top (100k).

Resolder the tracks with new solder and hopefully job done.

 

http://pexcom.com.au/z32cms/e107_plugins/content/content.php?content.321

 

Graham

 

Thanks for this. I will take the new clocks apart and check them out.

You say it fails at the same speed everytime! is that with or without the convertor on each dash?

 

If not it may be an issue with the speed sensor in the gearbox, try the clocks without the convertor, although in KMs it may well tell you if its the clocks or the convertor

I had exactly the same problem, dropped of at about 68 mph, then as soon as I slowed down to 68 mph it sprung back into life, tried a different converter, still the same. I cured it by taking a chassis ground and a live feed from my radio loom straight to the converter, works perfectly now. I think the feed on the back of the speedo hasn't got enough balls to power the clocks and converter.

You say it fails at the same speed everytime! is that with or without the convertor on each dash?

 

If not it may be an issue with the speed sensor in the gearbox, try the clocks without the convertor, although in KMs it may well tell you if its the clocks or the convertor

 

Yep same speed every time. I had the youngest and her friend in the car so it ended up as a game with them telling me I was going too fast again!

 

Will take the converter out and take it for a test drive to see if it does it again. If it doesn't fail, I will put my old converter back in.