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Old 10-20-2008, 12:03 PM   #1
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1982 28' Airstream 280
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A wiring nightmare

I have a wiring mess that I would like to get straight. Bought a 82 Airstream Motorhome with an isuzu engine last year and came with an electrical system made of inconsistent colored wires connected with electrical tape, duct tape, masking tape and silicone. I would like to put back together correctly.
So here are my questions:

what is the theory of operation of the tach circuit?
what circuit gets its signal from the alternator?
what does the circuit look like?
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Old 10-20-2008, 12:14 PM   #2
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I have a wiring mess that I would like to get straight.
Ouch! What exactly is not working, or are you just looking to clean it up?
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Old 10-20-2008, 12:25 PM   #3
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The tach is blown. so I bought a new tach and I want to wire it correctly. What caused it to blow? Too much voltage. The regulator was wired wring as was the alternator. Just a mess.
what should I see at the send wire? Right now there is nothing. A pulse, steady volatge, what?
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Old 10-20-2008, 12:42 PM   #4
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Quote:
what is the theory of operation of the tach circuit?
what circuit gets its signal from the alternator?
what does the circuit look like?
I may be of some help...the tach usually gets its signal from the ignition system, and your MH should be old enough to have a distributor, so look there.

The only thing driven from the alternator (usually), is the red warning light on the dash, save of course, charging the battery, and that should be the large red wire. The regulator in the alternator will have two other wires going to it, again usually, and they are the "on" wire from the ignition, and the wire that goes to the red light.
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Old 10-20-2008, 12:51 PM   #5
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I may be of some help...the tach usually gets its signal from the ignition system, and your MH should be old enough to have a distributor, so look there.....

Isuzu engine - Diesel
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Old 10-20-2008, 01:02 PM   #6
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The tach is blown. so I bought a new tach and I want to wire it correctly. What caused it to blow? Too much voltage. The regulator was wired wring as was the alternator. Just a mess.
what should I see at the send wire? Right now there is nothing. A pulse, steady volatge, what?
The tachs do blow, it's a pulse on my diesel. They need to be calibrated.
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Old 10-20-2008, 01:05 PM   #7
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we are going to tinker around with it. I will let you know our progress.
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Old 10-20-2008, 01:19 PM   #8
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we are going to tinker around with it. I will let you know our progress.
Good luck, we'll be down there in a few weeks on our way south, let me know
if I can help; I don't think I have a schematic for the tach circuit.
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Old 10-20-2008, 01:20 PM   #9
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so it's pulse. awesome. what post of the regulator does the wire that feeds the tach come off of?
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Old 10-20-2008, 01:36 PM   #10
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Mike - Thanks for the offer to help. But i am hoping we will be heading south as well this week. I saw your pics about Flagstaff. I was raised in Cottonwood.
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Old 10-20-2008, 01:40 PM   #11
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I was raised in Cottonwood.
Know the area well, we stay at Dead Horse.
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Old 10-20-2008, 02:13 PM   #12
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You can run without the tach: keep a eye on the pyro & temp gage.
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Old 10-20-2008, 02:24 PM   #13
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Special tach for diesels?

Engine rpm on diesel engines is usually determined by measuring the frequency of the alternating current voltage produced by the alternator before it is rectified into direct current voltage to service the vehicle's electrical system. Frequency increases as the engine spins faster. "Alternator whine", an audible by-product of the initial AC voltage, was a problem in the early days of car stereo.

There should be a connection on or about the alternator for the tach.

I do not know if a diesel vehicle needs a "diesel tach" or if a conversion to pulses (allowing the use of any ole tach) is done at or about the alternator.

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Old 10-20-2008, 02:26 PM   #14
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we have run it without the tach for almost a year. We bought a new one a few weeks ago and want to set it up right. spent many days be obnoxious as a kid in dead horse.
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