Testing Phase 1 916 Speedometer and Sender
Hi All! This is for a Phase 1 916 GTV Spider. As my title reads, testing the speedo and sender. It seems dead.
I saw a link to an old thread where someone mentions that he tested the connection from the speedometer going to the sensor (lets you at least know if the speedometer head and wiring to it is ok) on his 116 Alfetta GTV.
He simply switches the Ignition on and disconnects the 2 wires going to the speedometer Sender/Sensor: one wire is attached to an ordinary metal file and the other wire scrapes along another end of the file thus serving as a very crude pulse generator. The speedometer reading should then be visible and jumping around, if not, then the speedometer itself and/or the associated wiring is suspect.
My Questions: 1) Will this work on a Phase 1 916 spider, anyone actually done this on a phase 1? Realize that there were only a handfull or so of the 916`s brought into this country by the now long gone Alfa dealer! That means that if the test mentioned above can possibly damage any part of the electrical/electronic system, then getting new or even surplus parts here are practically impossible as everyone keeps their 916`es.
2) Any way to test the Sender/Sensor itself? I`m not an electrical/electronics person, but since there is a coil in the sender that the rotating metal spoked wheel (from the transmission) comes into indirect contact (inductance?) with, Can i use an ohmmeter to check coil resistance, or does the internal electronics of the sensor prevent this test? P.S. I couldnt find it on a Cd Workshop manual, or did i just miss it? Thank You!