Massy 365 no charge

Green grower · Jun 30, 2018

Having problems with charging checked cables to altornator
Feed connection was frayed recrimped new connector
Wire goes into a black plastic piece another wire goes onto frame of altonator and male pin on other end does not have circuit through from male pin to feed but 350ohm to earth is this faulty?

Mursal · Jun 30, 2018

Not sure to be honest?

Below is connections for Lucas alternator like in the picture fitted to most Massey's of that vintage? ?

Only two connections necessary.
Large wire coming from alternator goes to battery connection on starter
Small wire from warning light in the dash (rub it off clean metal to light the bulb) goes to the small push on on the back of the alternator. A light rev of the throttle light should go out and battery voltage will be on the rise.

Wire going to frame is an earth only necessary if the alternator is mounted on rubber mounts.

jcb-right-hand-lucas-acr-alternator-100-120-[3]-10125-p.jpg

Green grower · Jun 30, 2018

Not quite the same this one is itiy magnetic marranelli
Plastic plug with 3 cables 2 large (live)and small then the feed I mentioned earlier

Mursal · Jun 30, 2018

Can you get a picture?
As I'm not up to speed on the pin outs of the Marelli alternator didn't even know they were fitted to 365

Tech12 · Jun 30, 2018

Hi: With your battery disconnected, use your multimeter set to ohms and check between the frame of the alternator & a good clean spot on the engine metalwork. You should have a very low resistance reading, ideally less than 1 ohm. If the reading is high, reconnect the battery and connect a jump lead between the metal alternator frame and a good earth on the engine, start the tractor & see if it charges.
If you have 2 wires on the alternator then normally the thick charge wire will go to the battery and the smaller wire would either go to the charge indicator or an external voltage regulator.
A picture of the alternator may help.

Tech12 · Jun 30, 2018

Not been able to find a schematic for the 365. From what I found though, if the system hasn't been modified then the thick cable does go to the solenoid & the thin cable goes to an external regulator.

Hope that helps some: Andy

Green grower · Jul 1, 2018

Mursal said:
Can you get a picture?
As I'm not up to speed on the pin outs of the Marelli alternator didn't even know they were fitted to 365

Green grower · Jul 1, 2018

here's pic of wiring and weird board sorry for the delay

Tech12 · Jul 1, 2018

If you can't get a picture then any details from the alternator rating plate, such as a model will help.

multi power · Jul 1, 2018

Is the battery light on the dash working?

Tech12 · Jul 1, 2018

Hi : Thanks for the picture, the small board needs to be insulated. Looks like it's shorting to ground, the W terminal and small earth terminal are for a tachometer takeoff.
The 3 wires you need to look at are on the black plug.

Green grower · Jul 1, 2018

Removed insulation to see what was inside tested all connections
At 20k all show open circuit between casing

Green grower · Jul 1, 2018

Tech12 said:
Hi: With your battery disconnected, use your multimeter set to ohms and check between the frame of the alternator & a good clean spot on the engine metalwork. You should have a very low resistance reading, ideally less than 1 ohm. If the reading is high, reconnect the battery and connect a jump lead between the metal alternator frame and a good earth on the engine, start the tractor & see if it charges.
If you have 2 wires on the alternator then normally the thick charge wire will go to the battery and the smaller wire would either go to the charge indicator or an external voltage regulator.
A picture of the alternator may help.

multi power said:
Is the battery light on the dash working?

Dash batt light on at switch on out on starting

Tech12 · Jul 1, 2018

If you mean the connections to W & ground from the small PCB then don't worry about them for now. They shouldn't have any effect on charging. Check that the alternator case is well earthed first, with the Big black plug disconnected the 2 big brown wires should be live all the time.
I normally use a normal 12v test light for checking this sort of thing, a multimeter can pick up ghost voltages.

Green grower · Jul 1, 2018

Tech12 said:
Hi : Thanks for the picture, the small board needs to be insulated. Looks like it's shorting to ground, the W terminal and small earth terminal are for a tachometer takeoff.
The 3 wires you need to look at are on the black plug.

Tech12 said:
If you mean the connections to W & ground from the small PCB then don't worry about them for now. They shouldn't have any effect on charging. Check that the alternator case is well earthed first, with the Big black plug disconnected the 2 big brown wires should be live all the time.
I normally use a normal 12v test light for checking this sort of thing, a multimeter can pick up ghost voltages.

Tech12 · Jul 1, 2018

Sorry I'm going to bow out now as your not actually answering the questions your asked, your just re-posting the questions.

Good luck finding the answer to your problem.

Green grower · Jul 1, 2018

Test with ign on 12.5v 2 large wires on plug when fitted
Small wire 1v
When running large wires stay the same 12.5v
Small wire up to 15v

Mursal · Jul 1, 2018

You have an alternator with built in regulator so only need two wires.

Disconnect that PCB and hand it up somewhere ............

The large wires seem to be going to the battery (unless you have a bad connection)
Small warning light wire coming from tractor, identify it by earthing it (connect to the frame of the alternator). With the ignition on you should have control of the warning light, disconnect wire and it goes out?

Then with that identified connect to a small terminal on the back of the alternator (usually marked WL or sometimes F), if you choose the wrong one, it wont come on with the key or wont go out when running.

Keep it simple, shout if you get stuck ..............

Edit:
The above applies if the alternator is good and working properly.

Green grower · Jul 1, 2018

Mursal said:
You have an alternator with built in regulator so only need two wires.

Disconnect that PCB and hand it up somewhere ............

The large wires seem to be going to the battery (unless you have a bad connection)
Small warning light wire coming from tractor, identify it by earthing it (connect to the frame of the alternator). With the ignition on you should have control of the warning light, disconnect wire and it goes out?

Then with that identified connect to a small terminal on the back of the alternator (usually marked WL or sometimes F), if you choose the wrong one, it wont come on with the key or wont go out when running.

Keep it simple, shout if you get stuck ..............

Edit:
The above applies if the alternator is good and working properly.

Green grower · Jul 1, 2018

Big thanks to all who replied will try again tomorrow

Massy 365 no charge

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