Massey Ferguson MF80B Backhoe

I am working on a Massey Ferguson MF80B Backhoe way up in the mountains of Northern Colorado. I am trying to get it running for a WWII hero who is 89 years old and has Parkinson's Disease and Alzheimers. I'm trying to put some value to his property instead of it just being useless pieces of metal.

I'm trying to straighten out two wires coming off of the starter solenoid and one wire coming off of the ignition.

All three are hanging loose

I have been to Massey Ferguson here in Greeley, CO and got a copy of the wiring diagram for a MF80B TLB; but, when I compare what the wiring diagram shows and the wiring on the backhoe, there is no comparison. So, I'm in a quandry.

What I need to know is where each of two black 12 mil wires, each connected to it's own terminal on either side of the positive connection from the battery go to. Each of the black wires is about 8-10 inches long and are just hanging off of the starter solenoid.

The third wire is a tan or faded yellow 10 mil wire coming from the ignition switch on the instrument panel inside the cab and going to the left side of the engine near where the two black wires from the starter solenoid are--close enough that they could all be connected to each other.

I tried that, but I still couldn't get the starter to operate. The batteries are good on properly connected.

What I need to know is where these three wires go to that I can get some power to the starter motor. This is also the model that has a starter button to the left of the ignition, both of which are on the left hand side of the steering wheel on the instrument.

Any help would sincerely be appreciated.

Never heard of a B model for the 80. An MF80 is a big machine though with the 6-354 Perkins. Any reputable place that does auto/HD electric and/or starters and such should be able to help you. I doubt there's anything special with the wiring. Dave

Here is a link to the Massey Ferguson Parts website. Look down the list and you will see the wiring layout. It is not a schematic!

http://www.agcopartsbooks.com/EpsilonWeb/book.aspx?book=agco/651313

The best investment you can make if you are trying to work this out is a cheap multimeter. It will allow you to check voltage and continuity. While you are at the autoparts store buy a battery terminal cleaner. Then go back and check the batteries and see if there is any juice left in them. If not, put a charger on them and see if they will take a charge. There is nothing more frustrating than trying to start an engine with weak batteries. Clean all your battery connections on both ends to make sure you have a good circuit. If the batteries are bad use a set of jumper cables to check the starter / solenoid.

If you have 12 volts to the solenoid you can test the starter solenoid by jumping between the heavy battery lug and the small start terminal lug on the solenoid.

Once you have figured out if the starter / solenoid is any good you can worry about the wiring to the switches and alternator. If the starter isn’t any good the switches are sort of a moot point.
My 2 sents worth
John

135fan's reply gave me an ahah moment. I have the manual for the MF 1100 which as the Perkins 354 in it. The wiring diagram here shows the following

There are 2 red 14 gage wires from the battery terminal on the solenoid in parallel with 2 30 amp fuses in parallel to a junction with a 14 gage red wire to the voltage regulator and the other 10 gage red lead goes to the negative side of the ammeter. The positive side of the ammeter goes thru a 14 gage dark green w/white wire to the battery terminal on the starter switch. The 14 gage yellow w/black wire on the S terminal on the switch goes thur the neutral safety switch to the switch lug on the solenoid.

It shows a 14 gage yellow wire leading from the battery terminal side of the switch thru a 30 amp fuse to the lights and cigliter.

Hope that helps
John

Just thought of something. Are you sure it's an 80B and not a 30B? Dave

Make sure it's out of gear before you jump any terminals! You'll be bypassing every safety switch on the machine. Easy to get hurt in just a few seconds.

Paul