Antique Tractors Forum

[hooksie007]

I'm working on my father in laws 1975 Massey Ferguson 175, but am having some trouble with the wiring. Here's a picture of what I got...

>

I know the colors of the wires, just didn't put them down

Now what I don't know....

Is there supposed to be another wire coming out of the alternator plug?

The two wires (Oil Pressure wire, wire out of regulator) come together in a single plug, but come out as two wires again, but have no clue where either wire goes.

There was another wire on the Ammeter, but it was burnt and just hanging. Don't remember which side it was attached to either.

Where is the other wire for the Inverter supposed to go?

And I don't know where to hook up the wire for the Gage lights...

Also there was a wire missing off of the plug for the light switch???

hopefully one of you can help me

[JJ. in B.C.]

This wiring has me scratching my head, do you know which type of
alternator you have ?, are the terminals on the reg marked ?
The Inverter usually supplys power to the gauges and on a diesel the
oil pressure switch sends power to the alternator to excite it.
_________________
JJ.

[hooksie007]

The alternator is a Delco-Remy, and the Regulator has no markings on it that I can see.
_________________
Father In Law's -1975 Massey Ferguson 175 Diesel

[JJ. in B.C.]

This is the usual connections for a Delco 10 or 12SI internally regulated
alternator on a gas tractor converted from genny to alt. and having the
original regulator removed, on a diesel the wire from the #1 terminal
on the plug goes to the oil pressure switch and you don't need the diode, wire from non load side of ammeter goes to battery, all other secondry power is taken from load side of ammeter. Not sure if this helps in your
particular application ??


_________________
JJ.

[hooksie007]

Well I was told by the company that I had rebuild the Alternator that i could buy a new plug from them which would have the regulator in it, therefore replacing the old regulator, but I'm not sure how everything would get wired then Plus it's another $40... And my wife would probably kill me since I just put $96 in a new battery, and another $98 on the Alternator rebuild...
Here's the alternator as it is now back on the tractor


As you can kind of see, the wires are cracking and the plug is missing a wire, plus it's melted pretty good since the exhaust leaks right above it. But that's another problem for another day...
_________________
Father In Law's -1975 Massey Ferguson 175 Diesel

[hooksie007]

I guess I should have also mentioned that it's a Diesel. But you may have figured that out already..

I'm hoping someone here has a diagram that they could post me. I have an IT manual with a diagram, but it's VERY vague. I had to scan it and blow it up just so I could see it better... But still no help.
_________________
Father In Law's -1975 Massey Ferguson 175 Diesel

[hooksie007]

Ok, so I took a load of metal to the scrapyard to get myself some spending cash. So I went and bought a new regulator that plugs directly onto the back of the the alternator. Getting one step closer



I was told to put the Red wire to the BAT terminal, and the black wire to the GRD terminal, and to just leave the orange wire not connected to anything. But how is the alternator supposed to get excited???

Also, what is the Inverter supposed to be for?? It had a wire going to the light switch, but why??
_________________
Father In Law's -1975 Massey Ferguson 175 Diesel

[JJ. in B.C.]

I am not familiar with the alternator that you have or this regulator
that plugs in to it, some alternators are self exciting and this could be the case with yours ?
The dash lights are a type of fluorescent bulbs, the inverter supplies
high power AC current to them.
_________________
JJ.

[JJ. in B.C.]

Forgot to mention, it is a good possibility that your inverter may be burnt
out, most are on these old tractors, they are listed as an obsolete part
and no longer available.
_________________
JJ.

[hooksie007]

That makes scence now about the lights and the Inverter... Not really worried about them anyway. Thanks for that info, I'll probably just get rid of it. One less thing to worry about
_________________
Father In Law's -1975 Massey Ferguson 175 Diesel

[JJ. in B.C.]

There would be no harm in trying the inverter to see if it works, it just takes power from the light switch. If you are removing the old regulator
you can connect the Bat lug on alternator to the load side of ammeter,
and you will have to find a power source for fuel gauge such as the oil pressure switch.
_________________
JJ.

[hooksie007]

I'll haver to make a new diagram since I started this post
I've gotten rid of quite a few wires that didn't seem to have a purpose for me. I'll try to get it up in a day or two.

How would I go about testing the inverter. Was going to take it out of the tractor, but as it sits onder the dash I only see two wires. Don't I need four, two for input and two for output?
_________________
Father In Law's -1975 Massey Ferguson 175 Diesel

[JJ. in B.C.]

Cain't remember how the inverter is wired to the lights, will see if i can
find out
_________________
JJ.

[mfergy175]

Any luck on the new diagram. I bought an M175 diesel last year and I'm having the same wiring issues. It has a Delco Remy alternator and I'm guessing it has a built in regulator because I can't find one on the tractor. There is a resistor under the dash with 2 terminals and I'm guessing this is to power the guage lights. I just finished replacing all the gauges with new ones because all the original gauges were rusted out and non functional. The wires for the oil pressure, fuel, and tach gauges had rusted loose and fell apart. Your new diagram would be extremely helpful. I've searched all over the internet for MF175 wiring diagrams with no luck but came accross your post in the process. The IT manual's diagram is to small to read.

[JJ. in B.C.]

So how ya makin' out with the wiring hooksie
_________________
JJ.