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Cat 3208 Tach Drive

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Old 06-07-2016, 12:09 PM
Allisfordih Allisfordih is offline
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Cat 3208 Tach Drive

There is some kind of electric device attached to the front of my Cat 3208 out of my 77' C8000 where the tach cable attaches. What is this electrical thing? What does it hook to? And is it critical for anything? Mine has a split in the case and the wires were cut when I bought the truck. I attached pictures to show what I'm talking about. Thank you in advance for your help.
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Old 06-10-2016, 06:48 AM
awhtx awhtx is offline
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Whatever it is it is converting the speed of the rotating tach drive to an electrical signal and sending that signal somewhere.
Did the truck have Cruise Control? Engine Overspeed warning light?
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Old 06-10-2016, 09:02 AM
Allisfordih Allisfordih is offline
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It was originally a pumper truck. No cruise control, and I don't know about an over speed light. The regular tach drive cable hooks up to the end of that device.
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Old 06-16-2016, 07:51 PM
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Lower pic: This is the only C series pic there is. 17365 is the tach cable.
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Old 07-18-2016, 10:40 AM
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Fire truck have two tachs, one in the cab (factory) and one on the pump panel for the engineer to monitor engine speed while pumping water. The adapter you have most likely sent a signal to a electric tach on the pump panel. This adapter would be an aftermarket add on by the company that built and installed the pumper body.
Fire trucks also had oil pressure and water temp gauges on the pump panel so you should have extra sending units on the engine for those unless someone has removed them.
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