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Old 05-28-2020, 04:21 PM   #1
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Tach question

As I've been learning about tach calibration, I've noticed that some operate with a mechanical take-off & variable ratio alternator pickup and others with a magnetic pickup.

Simple question I'm sure, but how do I know which mine is?

Thanks
BD
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Old 05-28-2020, 07:14 PM   #2
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Check your engine specs for a start. Then you verify is see if you have wires connected to the specified location. If so, you could disconnect them and start the engine to witness the effect at the tach. If no wiring is connected to the specified location, I would think you are stuck with wire-following from tach to engine.
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Old 05-28-2020, 08:17 PM   #3
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Do you have any electrical schematic drawings for your engines? They would show the source of the tach pulses.
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Old 05-28-2020, 08:44 PM   #4
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Thanks. All of the manuals and documentation is on the boat. I'll see it in a couple weeks I guess.

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Old 05-28-2020, 09:51 PM   #5
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Look to see if a grey wire is hooked up to the alternator. That is the tach signal wire.
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Old 05-29-2020, 05:38 AM   #6
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Quote:
Originally Posted by BDofMSP View Post
As I've been learning about tach calibration, I've noticed that some operate with a mechanical take-off & variable ratio alternator pickup and others with a magnetic pickup.

Simple question I'm sure, but how do I know which mine is?

Thanks
BD

I think you said you've got Cummins 450Cs? If correct, yours is magnetic

-Chris
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Old 05-29-2020, 06:57 AM   #7
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Originally Posted by ranger42c View Post
I think you said you've got Cummins 450Cs? If correct, yours is magnetic

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I do. Thanks Chris. I'll do a little research into how that all works. Good learning opportunity for me.

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Old 05-29-2020, 07:05 AM   #8
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Well that was easy. Again sbmar.com comes through with good information and great pictures!

Thanks for all the tips.
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