Fiat Dino Forum (FDF)

The square wave signal output from the frequency generator should have an amplitude of zero to 10 volts, e.g. the output voltage should be around 10 volts.

You need a square wave generator, which is set to 250 HZ and an output voltage of 0-10V. Connect the generator output to ground and the tacho input, and supply 12V to the tacho. Now gently turn the trimmer/potentiometer on the tacho circuit board until the tacho displays 5000 RPM. Let it run for fiv...

If the tach is wired to the right [D] screw terminal on the red squarish ballast resistor then the wiring is ok. If it shows less RPM than you actually have then it requires a recalibration, which can be done by a speedo shop. You can also do it on your own if you have access to a square wave genera...

Barnfind, the wiring diagram in the middle is the correct one for your setup: http://www.dinoplex.org/PDF/Dinoplex_AEC_101_Wiring_Diagram.pdf Early 2400 Dinos came with a AEC101CA/CB, the correct BZR205A ignition coil is both the Normale and the Emergenza coil, based on thr wiring/switch position. G...

What has this to do with a classic Dino?

S125A/AX/BX has three cams and two sets of points, one for each bank. S125C has six cams and two sets of points, a standard one "A" and a 5.5 degree retarded one for the emission control setup in later Ferrari Dinos. http://www.dinoplex.org/#Marelli_S125 Keep in mind that dwell is not rele...

Welcome

Sounds like the thryristor THR1 is broken, maybe also the avalanche diode D5. Replacing THR1 has a good chance to get rid of this problem.

http://dinoplex.org/#Dinoplex_AEC101

Good luck,
Adrian

No luck have tried everything I can think of…Have opened up the forum from my laptop without a problem , I think it may have something to do with my internet security…Kaspersky my have deleted some necessary cookies. Not sure what to do now, will keep trying. Must be something related to your brows...

Got it!