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#1
07-29-2012, 10:45 AM
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Diesel Tach Inop.
Need your input please.
1983 300D Turbo. Tach does not move at all. 1. pulled cluster verified it is connected in the back. 2. purchased new replacement Tach Amp installed. 3. inspected sensor and it looks as though it is actually touching the metal pin on the balancer. So it is surely close enough. With Amp removed. Pin 2 to Pin 6 reading 12 VDC Pin 2 to pin 3 reading 10 VDC * Reading 77ohms from sensor ground (pin 7) to Sensor + (pin 9). * Sensor shield (pin 8) to pin 9 is reading open. * Pin 7 to pin 8 are reading open. With Amp installed. * Glow Position Pin 8 to Pin 9 reading 2.4 VDC * Glow Position Pin 7 to Pin 9 reading 2.4 VDC Assuming here that Pin 8 is a shielded ground (shorted to pin 7). I believe all reading are as they should be for a working Tach. What have i failed to check other than the Tach itself failed internally? Thank you for your time. 
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