sdisselhorst

I am attempting to bench test my gauges, but I do not have the wiring diagram to know the pinouts of the connectors. Does anyone have this? I have decided if I can just bench test my gauges, it would save a lot of time in my troubleshooting.

I am pretty sure I can recreate the signals needed to simulate driving, but I need to know which pins are what signal.

-Thanks

Maybe I could make a "gauge tester" unit and make it available, or at least its design, on these forums.

Van

http://www.cannell.co.uk/Manuals_Original.htm

sdisselhorst

None of the links there seem to be real. Can't download the PDFs.

Van

Oh, bummer. They used to work. Do a web search (or a rennlist search).

cliffjumper

Which dash style do you have?

sdisselhorst

1986 944 NA, should see a pic.

931guru

951

Tom M'Guinn

I just went to Best Buy and bought their 944 Instrument Cluster Signal Simulator. Video below... Happy to help if I can....

https://www.youtube.com/watch?v=u_Tv...ature=youtu.be

sdisselhorst

Wow. Exactly what I need. Can I borrow it?

FRporscheman

Did you make that yourself? I'd love to build one!

944Ross

I believe that's a variable frequency square-wave generator?

Tom M'Guinn

You could call it that -- it is an arduino project I've been making to drive the instrument cluster on the bench. Since the first video, I redid the code so that the speedo increases linearly with the ****.



The speedometer and the tachometer work on ground pulses -- the faster the signal is pulsed to ground, the higher the reading. For details on the speedometer, see my calibrator project here:

http://members.rennlist.com/tom86951...r%20Page1.html

The arduino reads the pot on the **** and creates it's own pulse to drive the speedometer. The tachometer works the same way, although the pulse rates are obviously different.

The other gauges are essentially volt meters. See more info in these threads:

https://rennlist.com/forums/944-turb...achometer.html

https://rennlist.com/forums/944-turb...e-control.html

https://rennlist.com/forums/944-turb...e-control.html

FRporscheman

That's a great project, I think I'll make one myself!

dorschmix

None of the links there seem to be real.

sdisselhorst

So, the speedometer doesn't need to be driven with anything stronger than the Arduino output pin? I figured it would need a pulsed 12v signal going through a transistor or FET. Thanks for the info!