Massey not charging

[Mursal]

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[Tommy]

Sorry, that male is marked with a w it's been rubbed slightly making it look like a dash. Should the purple wire be going to this and it's been wired wrongly

 

[Tommy]

The thin brown wire has no power or continuity to the battery, I presume it takes power away to something

 

[Mursal]

Worth a try, but if in doubt just tip the terminal with the wire first, so you can disconnect.
Is there an L beside it for Warning Light?

Yes thin brown must be running the dash, when you have nothing with it disconnected.

I would think the alternator they took off, had a bolt for WL rather than a push on connection, leaving them confused.

 

[Tommy]

There's no L along side the W. I've just tried pushing the ring connector of the purple wire to the spade marked W and it made no difference to the voltage, as soon as I put the work lights on the voltage drops to 11.6

 

[Mursal]

Try the 5watt bulb from B+ to the push on, see does it go out with a fast tick over?

 

[Tommy]

I tried it from the battery + with the bulb(5w) again to the push on and it stayed on just like it did with the D+

 

[Mursal]

Alternator seems to be a dud as it should charge when excited from the battery and you have tried all possible terminals.
B+ must be connected to the battery and the alternator would have a good earth through its mounts?
They must have been struggling ot get it to charge also, when they were trying other terminals.

 

[Tommy]

I'll give them a ring and get them to look it over properly this time, they've been a bit shy about offering to come out to it so far

 

[Mursal]

Pity you haven't an alternator to try off something else, but yes that would be best.
Non of them like after sales especially if it get like work .......

 

[Mur Huwcun]

Make sure the heavy wire to battery is ok all along it's length. If the contact breaks after alternator has started charging it will fry the alternator. Seen a customer fit three alternators on a tractor, all coming back faulty. It was a dodgy connection on the eylet on the starter solenoid. The fact that the wire has continuity does not indicate that it can carry the load generated by the alternator. Get them to double check the loom.

If you earth the violet wire when off, does the charge warning lamp glow? Theoretically it should.

The piece you've taken off (first pic) looks like some sort of diode or similar to stop the current only going one way

 

[Tommy]

If you earth the violet wire when off, does the charge warning lamp glow? Theoretically it should.

This was one of the things Llansillin said to check, and although it didn't then I'll check again. The thick wire will be checked over when I go out to feed, possibly the damage has been done. Disappointing really as it wouldn't start the day after I got it

 

[Mursal]

But it will be easily fixed, not life threatening, just a gremlin.
They shouldn't have given it to you, not charging.

To check connection to battery:
Load the wire by connecting a large (at least 55watt) bulb at the B+ terminal of the alternator, the continuity tester will not stress the connections enough.

The violet wire has little or no control of the charging light, you disconnected it earlier and the light stayed on. You then started the tractor with the wire disconnected and the light went out.

Just a thought, there isn't another wire in the loom going to the alternator?

 

[bartz]

should be 12 v to alternator on purple wire excitement line as mursal says thick brown should go straight to starter alternator output .the ignition light is not actually a charging light but a low voltage warning. that little box in the loam you found is a resister in the excitement line.

 

[Tommy]

should be 12 v to alternator on purple wire excitement line as mursal says thick brown should go straight to starter alternator output .the ignition light is not actually a charging light but a low voltage warning. that little box in the loam you found is a resister in the excitement line.

Could this be giving the bother? The long thin resistor near the male spade gives it's rated resistance, but can't get any reading from the bottom two.

 

[Mursal]

If the bottom two are diodes (one way valves for current flow).
If you have a diode tester in your multimeter, 0Volts on the meter in one direction (open circuit) and 0.5 to 0.7Volts in the other direction, which is correct for a good working diode. Diodes give very little trouble in that type of application.

Hope this helps rule out all possibilities ...........

 

[Tommy]

I've taken it back to Llansilin this morning to let them look it over and get the air con fixed while its in. I'll report back when I know more.