780 alternator wiring

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bengentry6
Posts: 21
Joined: Sat May 13, 2017 7:18 pm
Location: essex/suffolk

780 alternator wiring

Post by bengentry6 » Fri May 26, 2017 12:29 pm

Hi guys,

On my 780 there was a loose brown wiring coming off of the starter solenoid which I assume connected to the alternator to charge the battery, but i'm hesitant to connect it back to the alternator because there are three connections. Could someone tell me which connector to put it onto?

Thanks

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bedwards1966
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Location: North Yorkshire

Re: 780 alternator wiring

Post by bedwards1966 » Fri May 26, 2017 8:50 pm

Assuming that the tractor has the ordinary Lucas ACR alternator the spade terminal(s) which supply the output are the two large ones which are actually connected together. The small spade is connected to the charge warning lamp to excite the alternator.

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bengentry6
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Location: essex/suffolk

Re: 780 alternator wiring

Post by bengentry6 » Thu Jul 20, 2017 9:47 pm

bedwards1966 wrote:
Fri May 26, 2017 8:50 pm
Assuming that the tractor has the ordinary Lucas ACR alternator the spade terminal(s) which supply the output are the two large ones which are actually connected together. The small spade is connected to the charge warning lamp to excite the alternator.
I've tried connecting one of the large spade terminals to the live connection of the starter solenoid which is where the live battery wire is connected but as soon as I start the engine and the alternator starts to spin there seems to be a load of smoke come out. Any ideas? has the alternator burnt out or have I missed something?

Thanks

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mart1602
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Re: 780 alternator wiring

Post by mart1602 » Thu Jul 20, 2017 10:29 pm

there should be a spade on the soleniod for it

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bengentry6
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Re: 780 alternator wiring

Post by bengentry6 » Fri Jul 21, 2017 7:51 pm

So i can't seem to find a spade terminal, the only spade terminal is connected to the other end of the starter button wire. In the picture, the green and black are connected to the starter button (no key) and the red is straight to the live terminal on the battery. I am still a bit clueless as to what goes where!
rsz_1img_3048.jpg
rsz_1img_3048.jpg (95.56 KiB) Viewed 1920 times

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bedwards1966
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Re: 780 alternator wiring

Post by bedwards1966 » Fri Jul 21, 2017 8:49 pm

Can you provide some pictures of the alternator, including the back? I suspect it's an ACR that's knackered but it would be good to check that it's wired up correctly before condemning it.

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