Installing clock from Mazda 626 - wiring question

[tallbongo]

I've acquired a clock/cubby hole from a mazda 626 that I wish to install and I could do with some advice on the wiring, regarding the illumination.

It's a 5 wire device. I've identified the GND, ACC and +12V leads.

With power on, the clock functions. Connecting the ACC illuminates the backlight.

There are two more wires, TNS + and -. Connecting TNS+ to 12V causes the backlight to go off. I assume that the combination of TNS + and TNS - was connected to some form of dashboard illumination dimmer and the side/headlights relay.

I'm considering connecting the +12V and ACC to the leisure battery and just putting a pot in series with the backlight bulb to allow a variably illuminated clock while parked up.

I would however be grateful if anyone can explain how the TNS+ and - would normally be wired as I may be able to work a better solution than the one above.

Thanks in advance.

[dandemann8]

I would suggest drop a PM to Haydn Callow

[haydn callow]

No good asking me....I only know about BMW clocks

[Simon Jones]

Answers here: http://www.igmaynard.co.uk/bongo/forum/ ... ock+wiring

[tallbongo]

Thanks for the link. The 1.8 Kohm data is very useful. TNS seems to stand for the Nighttime System and was connected to a dashboard dimmer. I'm pretty sure I can recreate something similar using the data from that thread.