0-80 electronic speedometer in a mechanical hmmwv

erasedhammer · Jul 17, 2017

Action said:
That is what the sender screws onto. The piece on left is held into t/c with a y bracket. The 90 degree piece will not be reused. If you pull the piece out of the t/c, you will need to get the tm out to see how to put it back in the correct position. This is also where you change gears for different diffs to get correct speed reading.

Will the sender not work if it's plugged into the 90 degree adapter? Mine is not working, not sure of the cause yet.

I had a spare t case lying around and I did basically what you said, I unscrewed the 90 degree adapter, but to my surprise there was a square drive rod sticking out which the sender will not plug in to.

So unless there's some other adapter that is needed the sender will not plug directly into my t case. I have a 242 in case anyone was wondering

dilvoy · Jul 17, 2017

Open up your Parts TM and learn what that little thing is. It isn't mysterious.

erasedhammer · Aug 3, 2017

dilvoy said:
Open up your Parts TM and learn what that little thing is. It isn't mysterious.

Well it looks like there is a separate adapter that is used. The TM shows the sender plugging directly into the transfer case. Unfortunately thats impossible as both the t/c and the sender are male connectors. So where would I get this different adapter?

UPDATE:

Took another look at the wiring diagram. There are three wires coming off the sender, one being a ground wire. I do not have this?
Is there only supposed to be one wire that carries the signal from the sender to the speedometer? or two?

86humv · Aug 4, 2017

erasedhammer said:
Well it looks like there is a separate adapter that is used. The TM shows the sender plugging directly into the transfer case. Unfortunately thats impossible as both the t/c and the sender are male connectors. So where would I get this different adapter?
.

You must have skipped page 2 of this post...mount and sender are there.

erasedhammer · Aug 4, 2017

86humv said:
erasedhammer said:

Well it looks like there is a separate adapter that is used. The TM shows the sender plugging directly into the transfer case. Unfortunately thats impossible as both the t/c and the sender are male connectors. So where would I get this different adapter?
.

You must have skipped page 2 of this post...mount and sender are there.

Click to expand...

disregard that part, part of the 90 degree adapter stayed in the t/c making it look like the wrong gender connection.

But I got it working.
for 10 minutes.
then it broke again. All electrical connections are good to go. Ill be unscrewing and screwing the sender back in to see if something interally broke on the sender.

86humv · Aug 4, 2017

The plastic gear T/C housing has an adjustment depending on gear tooth count.

erasedhammer · Aug 4, 2017

86humv said:
The plastic gear T/C housing has an adjustment depending on gear tooth count.

Oh it was calibrated correctly. It just broke in 10 minutes.

Action · Aug 4, 2017

The little square drive pin is different between these and the older stule, iirc.

erasedhammer · Aug 4, 2017

86humv said:
The plastic gear T/C housing has an adjustment depending on gear tooth count.

It looks like the sender you sent me has broken.
The square drive rod broke off. Plus the inside looked like it was near the end.

Action · Aug 4, 2017

The square pin is not broken. It isn't there. You will need to buy that piece. I do not have the part number handy.

erasedhammer · Aug 4, 2017

Action said:
The square pin is not broken. It isn't there. You will need to buy that piece. I do not have the part number handy.

No its there, did you see the picture?

The square piece broke off.

Action · Aug 4, 2017

erasedhammer said:
No its there, did you see the picture?

The square piece broke off.

Oh, i was looking in the end of the sender, not sitting next to it.

86humv · Aug 4, 2017

Tab comes out by pulling it....if its broke now, it was not when sent.
Also there are 3 different gears for inside : 35 teeth for 2.56 gears, 36 teeth for 2.73 gears, and 41 teeth for 3.08 gears in Diff.
The gear/sender housing must be adjusted to proper numbers per teeth.
Here.s pics.

wildchildsteel · Jan 24, 2018

Does anybody know what kind of pulse and voltage readings I should be seeing on the t/c signal generator or where on vehicle I can tap into to get my readings?

Action · Jan 24, 2018

Do you have the electric sender in the top pic, 2 posts above?

wildchildsteel · Jan 24, 2018

yes, I do

Action · Jan 24, 2018

Are you trying to use a different guage or are you having a problem with what you have?

papakb · Jan 24, 2018

The unit is not a pulse generator, it's just a little DC generator. I have a couple of them and they output DC voltage when spun up with a drill.

wildchildsteel · Jan 25, 2018

I have a 90 on my t/c with test leads coming out of it. I am trying to install a piece of equipment with gps and it needs to be able to tell if the wheels are moving at what speed, just like the speedo. but I need to know what kind of voltage I should be seeing.

0-80 electronic speedometer in a mechanical hmmwv

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