Massey not charging

[Tommy]

Just had a Massey 8250. After I had brought it but before I had it home the error code E46 came up so they fitted a new alternator for me but it's still not charging. I followed the violet wire from the alternator up to the the multi plug above the engine it then goes into the cab by the clutch pedal. From inside the cab I have continuity from the alternator to a violet wire that goes into this

From this it goes into the fuse box. There is no continuity through whatever that is and the end closest to the male spade gets hot when running.
Could this be the problem? And did it need a new alternator in the first place?
Thanks for any info
Tommy

 

[Tommy]

Where's @MF-ANDY when you need him

 

[Mursal]

If you move from continuity and go onto Ohms on the multimeter to measure resistance, which I would think it is if getting hot. Very unlikely its the problem ...........
You have two wire on the back of the alternator, one large going to the battery and the violet one your working on, or have you more than two wires?

The way to check the alternator:
Charging light should come on with ignition? If you pull the WL (warning light) wire off the alternator it should go out?
With the engine on fast tickover the light should go out and stay completely out.
Voltmeter on battery should go above battery voltage with engine running maximum approximately 14.5 Volts.
See how you go .....

 

[Tommy]

Its a Valeo alternator, pulling the violet wire makes no difference to the warning light. The rev counter still works without it on. The wires go from B+ to the starter/battery and the violet one is on the D+ terminal. Not had chance to test the resistance yet but maybe not the problem anyway.

 

[Mur Huwcun]

Masseys get their rev counter input from the speed sensor by hydraulic pump rather than from the W terminal on alternator.

Follow the heavy wire from alternator back to starter (I think). Feel the loom for a lump. 62 series got fitted with an inline fuse in the cable from a certain age about a foot from the alternator. Yours may have one. They corrode and break the contact.

 

[bigg6480]

Are mf 8220 did this.

Masseys get their rev counter input from the speed sensor by hydraulic pump rather than from the W terminal on alternator.

Follow the heavy wire from alternator back to starter (I think). Feel the loom for a lump. 62 series got fitted with an inline fuse in the cable from a certain age about a foot from the alternator. Yours may have one. They corrode and break the contact.

 

[Tommy]

I'll check for that after feeding, they've changed then from the 3000's as they would pick up rev counter from the alternator
Thanks again
Tommy

 

[Mursal]

But if you start it with the violet not connected, the warning light will stay on?
D+ sounds like an output terminal (12volts all the time when running), have you got a WL terminal on the back of the alternator for the violet wire?

Better straight on image of the alternator back plate, as I cant find that one when I Googled them.

 

[Tommy]

Right, been out and couldn't feel a fuse and there's continuity through from alternator to starter so I assume all is good there.

The small male spade (bottom left) is marked - neg, when they fitted the alternator I assume they tried the violet wire on the other terminal to the left of where it is now as they have cut away at the plastic to get the wire to fit.
I shall ring Llansilin it the morning and see what they say about it as I suspect they know that the new alternator didn't cure the problem??? They have given me a few things to try over the past couple of weeks but no joy.

 

[Mursal]

Did you start it with the violet wire disconnected to see if the light stays on?
How do you know its not charging?
If in doubt connect 12Volts directly from the + (positive) on the battery to D+ it should charge.
Have you a good drive, sometimes the front pulley (in freewheeling type) can slip under load?
Best check battery wiring connection to alternator by connecting a large 55Watt 12Volt bulb to the alternator terminal, the continuity meter wont stress bad connections enough.

 

[Mursal]

Or better still a 12volt bulb (5 watt) between battery positive and D+ and the light should go out when charging.

 

[Tommy]

The light went out when it started without the wire on. I'm not sure what that does as it seems to make no difference if it's on or off. I'll give it a go with the wire from battery to d+. I don't think it's charging as with the engine at 1500 rpm and the front work light on the voltage is 11.5 and drops.

 

[Mursal]

If its any help, with the ignition on, you should have 12Volts on that violet wire to excite the alternator into charging.
You will now excite it through the bulb from the positive on the alternator.
Very strange the light goes out with the violet wire disconnected.

The heavier brown wire on the B+ is going where, I wonder? But should have no affect on charging, unless its the warning light wire, which is unlikely given its size and colour.

 

[Mur Huwcun]

Where's the other cable on B+ going? Should it be on that terminal? The eylet is not original. The bolt where the plastic has been chewed away just holds the plastic cover on, don't think it's an actual terminal. One wire must be connected to warning lamp though

 

[Mursal]

One wire must be connected to warning lamp though

Well you would like to think so ..........

 

[Mur Huwcun]

Well you would like to think so ..........

That brown wire doesn't add up though!!! @Tommy disconnect it and test for 12v or continuity to battery. It either feeds back to battery or feeds an ecu (autotronic box) but why from alternator!!! Or it's something completely different and shouldn't be there!!!

 

[Mursal]

Just noticed a male push on terminal what label has it got?

 

[Tommy]

Put a 5w light between +pos and the D+, the light didn't go out when we started it or with a bit of Rev on. I tried the wire then straight to D+ from the battery + and it made no difference to the voltage from the alternator but the wire was warming up quickly so I bottled out and pulled it. The thinner of the brown wires must have something to do with the ignition as without it I had nothing at the key

 

[Tommy]

View attachment 298122 Just noticed a male push on terminal what label has it got?

It's just marked with a - Shall I see if it's an earth, I assume it will earth through its own body

 

[Mursal]

You are either exciting the wrong terminal on the alternator, or its a pup. But the last one was taken off as well and the chances of two bad in a row would be slim.
Nothing marked as WL or the like on the back of the alternator, that we're missing?