stukinwa1978 Posted July 29, 2009 Share Posted July 29, 2009 Hello, I have a 72' CF 600 fire engine. The tach on both the pump panel and dashboard is not working. I attempted to trace the wires which go inside of a 1/2" jacket. The wire goes up over the transmission and toward the engine. It appears to terminate near the front of the engine around the oil filter. I am curious how a tach on a Mack is controlled. Also if anyone knows how to fix this. I am a new owner to this vehicle and am just starting to learn my way around this vehicle. Thanks, Jared Quote Link to comment https://www.bigmacktrucks.com/topic/10180-tach-trouble/ Share on other sites More sharing options...
Greg Rider Posted July 30, 2009 Share Posted July 30, 2009 Is your truck gas or diesel? Gas will feed off of the ignition coil and I believe diesel is triggered by a signal from the alternator. Rob would be better at this than I. Quote #1 on A-model registryIf I drink because of work, why can't I drink at work? Link to comment https://www.bigmacktrucks.com/topic/10180-tach-trouble/#findComment-38578 Share on other sites More sharing options...
Rob Posted July 30, 2009 Share Posted July 30, 2009 Is your truck gas or diesel? Gas will feed off of the ignition coil and I believe diesel is triggered by a signal from the alternator. Rob would be better at this than I.One would need to ascertain what powerplant is installed to answer further.While some diesels do in fact use a trigger from the alternator windings, most heavy equipment of this vintage use some sort of reluctor ring and a magnetic pickup to drive an electronic gauge of some type.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/10180-tach-trouble/#findComment-38581 Share on other sites More sharing options...
stukinwa1978 Posted July 30, 2009 Author Share Posted July 30, 2009 The engine is diesel. Paired up with an old Aerialscope tranny. Quote Link to comment https://www.bigmacktrucks.com/topic/10180-tach-trouble/#findComment-38582 Share on other sites More sharing options...
Rob Posted July 30, 2009 Share Posted July 30, 2009 The engine is diesel. Paired up with an old Aerialscope tranny.Is it an inline Mack diesel?Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/10180-tach-trouble/#findComment-38583 Share on other sites More sharing options...
stukinwa1978 Posted August 2, 2009 Author Share Posted August 2, 2009 The engine looks to be a V-6... I will check for sure. Quote Link to comment https://www.bigmacktrucks.com/topic/10180-tach-trouble/#findComment-38676 Share on other sites More sharing options...
Rob Posted August 2, 2009 Share Posted August 2, 2009 The engine looks to be a V-6... I will check for sure.If it is in fact a V6 engine, be sure to identify which vendor engine it is, (brand). I've never seen anything but a Mack engine in a "CF" series truck. Try to post a photo of what you have also.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/10180-tach-trouble/#findComment-38677 Share on other sites More sharing options...
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