Fire truck electrical problems - Team Camaro Tech
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post #1 of 6 (permalink) Old Mar 8th, 16, 06:12 PM Thread Starter
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Fire truck electrical problems

An acquaintance of mine collects fire trucks. He is nearly done going through a late 50's Mack pumper. It has a remote station with the pump controls behind the drivers door on the cab side. The pump instruments are mechanical. The engine instruments are electrical even though the ones in the dash are mechanical. There is a tach, oil pressure, and water temperature. All are defective. The gauges are positive ground. He attempted replacements from Summit. The tach functions but it's off. The engine has a mechanical drive with a pulse converter on it. At this point the rate isn't known though he can find out from the folks at the Mack museum. Is there a commercially made pulse converter? He also needs positive ground gauges. This appears to be a bigger problem than you would think. The gauges he got from summit are swedged so getting them apart to rewire is unlikely. Whoever he was working with at summit was out to lunch on grounding. Let me know if you have any input on this.

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post #2 of 6 (permalink) Old Mar 9th, 16, 05:45 AM
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Re: Fire truck electrical problems

My first thought is to use mechanical gages for oil and water temp. You may have trouble finding a long enough thermocouple for the water tem and then to find a place in the engine to put it. Some investigation is needed before purchase. The oil pressure should just be a matter of a long enough line and a tee in the existing connection for the front gage.

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post #3 of 6 (permalink) Old Mar 9th, 16, 06:12 AM
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Re: Fire truck electrical problems

Use a strobe tach for RPM.
On the gauges, isolate the gauge body from ground - duct tape? - and wire the gauge normally - pos to post.

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post #4 of 6 (permalink) Old Mar 9th, 16, 04:29 PM Thread Starter
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Re: Fire truck electrical problems

Thanks guys
He has ruled out the electrical isolation route. He is communicating with the gauge companies in the attempt to get specials made for the truck be it electrical or a really long temp cable. He really wants to go electrical though. Jake, what do you mean by strobe tach?

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post #5 of 6 (permalink) Old Mar 9th, 16, 06:22 PM
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Re: Fire truck electrical problems

Everett here, Jake is one of three dogs here.
Strobe tach is a pistol shape device, sometimes, like a timing light, one marks a spot on the rotating device then aim & shoot the gun to the mark and it measures rpm.
Some are tunable where the operator turns a dial to make the mark stationary and read the dial/readout, or the machine does the analyzing of 'seeing' the mark and noting the time between the marks and displays the rpm.

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post #6 of 6 (permalink) Old Mar 10th, 16, 05:24 PM Thread Starter
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Re: Fire truck electrical problems

Sorry Everett, hope I didn't offend Jake. I think they use that kind of setup on vibration detection gear too. Gawd, I have seen one of those in years, I was hoping to find an electrical pulse converter that was adjustable. oh well....

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