What have you done to your HMMWV today/lately

[kurtvk]

Hey Kurtvk, I bought the same Tach and today I went to test some connections and at idle my tach is all over the place upon acceleration ot goes back to around 1K and up as I accelerate. How is yours working? Of course, my connection was through the generator as I have the TD engine and not the NA. Attached is a link to the video. If you can help me understand or if anyone have any ideas I would really appreciate it.

HMMWV Tachometer connection

youtube.com

I had the same issue when hooked up to the AC tap on the Generator, it was much better after i hooked up a voltage divider to feed the tach (4 to1 if i remember correct, made with 1 or 2 k resistors). i think the voltage out the Gen was too high for the tach. And you have to set the tach to divide the pulses also. Now, mine is hooked up to the RPM sensor for the ICE Diagnostics connector, much more accurate (1 pulse per rev)

This was my original post....... the pulses are about 30V peak

Frequency @ AC terminal on N3135 Regulator with 200A Alternator

Hi all, in the process of hooking up a Tach i got from amazon. https://www.amazon.com/ELING-Diesel-4000RPM-Tachometer-Backlight/dp/B0C7Z8NTXN/?th=1 I'm trying to figure out what the relation is between the Frequency @ AC terminal on the N3135 Regulator and the actual engine RPM's. Measuring...

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[LeftCoast32]

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[TOBASH]

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