I have attached a pic below to see if it helps.
I have a Perkins M30 that I have replaced the instrument panel on and everything is working, except the tach. The tach does not budge, so I don't believe it to be a calibration issue.
On the back of my alternator there are four posts. Red, Black, and two smaller ones that come off the regulator. I believe that the factory panel was wired like I currently have it, but I am not 100% positive as it was several months ago that I took it apart.
Also, I have one wire left over on the new harness that I don't believe was used in the factory panel, the alternator excitation wire.
So, what am I doing wrong.
I have a Perkins M30 that I have replaced the instrument panel on and everything is working, except the tach. The tach does not budge, so I don't believe it to be a calibration issue.
On the back of my alternator there are four posts. Red, Black, and two smaller ones that come off the regulator. I believe that the factory panel was wired like I currently have it, but I am not 100% positive as it was several months ago that I took it apart.
Also, I have one wire left over on the new harness that I don't believe was used in the factory panel, the alternator excitation wire.
So, what am I doing wrong.