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dliterski · 09-14-2021, 05:53 PM

My tachometer only works when it is raining. I am assuming it's a short or bad magnetic sensor and not the gauge because it is new.
I need to know where the magnetic sensor is located. Some say it is driven off of the front axle and some say the alternator. I have a 1998 CC Intrigue.

Thanks

Skip426 · 09-14-2021, 06:55 PM

Front axle ( if there is in fact a sensor there) would be for a speedometer.
Usual would be output on the transmission .

Is your 98 engine a 12 valve 8.3L Cummins ?

If so alternator was used as an RPM sensor on many of those engines.
But I have no idea how to test for a signal .

dliterski · 09-14-2021, 07:42 PM

It is a 350 Turbo

Rsponsford · 09-19-2021, 03:56 PM

Quote:

Originally Posted by dliterski

My tachometer only works when it is raining. I am assuming it's a short or bad magnetic sensor and not the gauge because it is new.

I need to know where the magnetic sensor is located. Some say it is driven off of the front axle and some say the alternator. I have a 1998 CC Intrigue.

Thanks

There are three AC terminals on the alternator and one (doesn’t matter which one) is used to run the tachometer. Try moving the wire to a different AC post to see if the problem is corrected. Attachment 343604