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post #1 of 7 Old 05-05-2013 Thread Starter
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Ford Lehman 120 Tachometer Connection

My tachometer has stopped working when the engine is running although it responds when I turn the ignition key. I had a flood in the bilge and need to locate where the tach is connected to the engine to investigate if that connection is corroded. I have yet to locate where that connection may be. Any suggestions?
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post #2 of 7 Old 05-05-2013
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Re: Ford Lehman 120 Tachometer Connection

The tach takes off the alternator on the FL120. Your post doesn't make sense. How can it respond when you turn the key if the engine is not running? Chuck

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post #3 of 7 Old 05-05-2013
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Re: Ford Lehman 120 Tachometer Connection

You are in the wrong forum to ask this question.
Go to the Gear and maintenance forum, diesel engine sub forum and ask.

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Re: Ford Lehman 120 Tachometer Connection

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Originally Posted by CapnChuck View Post
The tach takes off the alternator on the FL120. Your post doesn't make sense. How can it respond when you turn the key if the engine is not running? Chuck
What I was saying is that when I turn the ignition key the Tach jumps but once the engine is running not does not register the RPMs

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post #5 of 7 Old 05-05-2013 Thread Starter
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Re: Ford Lehman 120 Tachometer Connection

What I was saying is that the tach jumps when I turn the ignition key but dyes as the engine begins runnning. Any suggestions?
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Re: Ford Lehman 120 Tachometer Connection

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Originally Posted by Craig Robelen View Post
What I was saying is that the tach jumps when I turn the ignition key but dyes as the engine begins runnning. Any suggestions?
Again, you are in the wrong forum.

You need to be in gear and maintenance...sub forum, diesel engines.

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post #7 of 7 Old 05-05-2013
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Re: Ford Lehman 120 Tachometer Connection

dead diode converting the ac from the pickup to dc for the meter.
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