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Old 06-13-2013, 03:24 PM   #1
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94 Dynasty tach signal help

Im a new rv owner. Bought a 94 dynasty with 8.3l. I got the coach with a few issues which im fixing. The owner said the rear main seal was recently replaced and the tach quit working after that(not sure if it is related or not). Anyways, im trying to get the tach working. I cant find the signal for it. I have been reading these forums and most people say the alternator sends the tach signal. The only wires on my alt are 2 very heavy power wires. No small signal wires. So is there another place i need to be looking for the signal wire? Any help would be awesome. Also does anyone know where i could get a replacement fill cap for the coolant expansion tank?
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Old 06-14-2013, 08:03 AM   #2
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We had a problem with that at one point. It turns out it was 2 purple wires in the bay where the inverter and electric is. I have some pictures of it on the pictures page on my blog where and what. Thom had accidentally bumped them and caused them to come partly apart. It took several hours of going over what he had done electronically over the last day before he found it. He then made sure that they would not come apart again.
You may also want to check to make sure your voltage regulator's plug will not shake out while going down the road. Yep ours tried to do that to.
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Old 06-14-2013, 09:30 AM   #3
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Mustang, my 96 8.3 Dynasty has a Leece Neville alt. My tach signal wire connects to a small stud on lower front side of alt. My tach signal wire is a #16 g wire. I do not know if this is helpful due to the difference in model years
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Old 06-16-2013, 01:01 PM   #4
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My alt has some small posts on the back side of it but no wires off them. And no posts at all on the front side of alt. So my alt is definitely not my tach signal. Anybody else got any ideas? This is driving me crazy.
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Old 06-16-2013, 07:54 PM   #5
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Mustang Guy,

Not sure what is going on with your tach, perhaps it has just been disconnected completely. Here is the dash panel schematic for my 95 Dynasty tach. From what I've seen of 94 schematics there are not many differences in the basic wiring between the two years. Hope this helps you out.

Jimmy
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Old 06-12-2019, 01:36 PM   #6
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Jimmy F,
I see you have the electrical drawings for your 95 Dynasty on this old post, woudl you by chance still have them? Would you sell me a copy?
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Old 06-13-2019, 08:05 AM   #7
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Quote:
Originally Posted by mustang guy View Post
My alt has some small posts on the back side of it but no wires off them. And no posts at all on the front side of alt. So my alt is definitely not my tach signal. Anybody else got any ideas? This is driving me crazy.

Yes it is , the tach on your vintage gets a pulse signal from the alt .

So unless someone has changed the alt to the wrong one you should
use the schematic posted by Jimmy F and trace for a broken wire .

The engine is in there backwards so the back of the alt is the front ,
so to speak .

Ray
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Old 06-13-2019, 09:06 AM   #8
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That photo is too small for me to read the wire labels or identify a terminal on the alternator.

Of course I'm not the one with the tach problem so it's not a problem for me - but I like to learn.

Is there a specific terminal (i.e. "R" or "I" or such) labeled on the alternator for the tach connection?

Is there a way you can post a larger photo that can be zoomed-in on? I find that if the photo size is around 300KB it is readable. Once it gets under 100KB it is generally too small.
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Old 06-13-2019, 10:05 AM   #9
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My 96 Monaco Windsor tach sense wire is on the Leece Neville alt., it is also a small #16 wire! I would look around really close on the back side of your alt. for a broken wire, I think mine is white, but it has been awhile since I changed it out! Rail!
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Old 11-29-2019, 01:44 PM   #10
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responding to an old post but on my 95 monaco when I replaced the original alternator it was the alternator and regulator were two pieces... the new one had the regulator built into the alternator. Perhaps the wire you were looking for is on the regulator, which from memory reminded me of an old Ford regulator.
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