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Tachometer issues
Posted: Wed Nov 28, 2012 10:32 pm
by anonymous.shyster
Hi all,
Since getting my car running, I've tried both IDM output (pin 2 on EDIS module), pin 35 (tach output on uS) and even soldered up my own module with the three diodes as shown on the EDIS page. None of these solutions has worked and I've no idea on how to troubleshoot or find out whether the fault is with the tachometer itself. Where could I start with this?
Re: Tachometer issues
Posted: Wed Dec 05, 2012 6:42 am
by Matt Cramer
Do you have any idea what signal the tach runs off of?
Re: Tachometer issues
Posted: Thu Dec 06, 2012 4:03 pm
by anonymous.shyster
I'm not sure. It's an old Jaeger unit, probably designed in the late 1960's. I'm yet to get any information from the guys on the French car forums. Is there some way to find out?
Re: Tachometer issues
Posted: Fri Dec 07, 2012 5:47 am
by Matt Cramer
About the only way I can think of is either guesswork or scoping the signal that got fed to it in a stock configuration.
Re: Tachometer issues
Posted: Fri Dec 14, 2012 4:33 am
by anonymous.shyster
Well, I got the logic board upgraded, but still no tachometer working from the IDM.
Re: Tachometer issues
Posted: Mon Dec 17, 2012 1:49 pm
by 24c
anonymous.shyster wrote:I'm not sure. It's an old Jaeger unit, probably designed in the late 1960's. ...
Small picture would help, front and back (showing connections). It's probably current sensing type, and FYI, to work with electronic ignitions you'd have to convert it to voltage sensing traditionally, but I'm sure you could do it with some external electronics now.