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boxoftricks

Member Since: 06 Feb 2019
Location: Home Counties
Posts: 748

2011 Defender 110 Puma 2.4 USW Zermatt Silver

Alternator wiring Cobra replica

Click image to enlarge

I’m putting a new loom in my cobra replica. Am I correct that the two terminals at the top isolated with black plastic are live with the larger one going back to the starter motor and the smaller live to the loom? The wire back to the starter motor connects to the terminal that has the main battery feed (heavy duty cable) to charge the battery. Then the lower terminal on the alternator is earthed? The alternator came with the car so no instructions. My electrical knowledge is very limited. [/u]

29th Dec 2019 6:32pm

muddypaws

Member Since: 22 Jan 2013
Location: Leicestershire
Posts: 122

2009 Defender 90 Puma 2.4 SVX Station Wagon Santorini Black

Wow, this takes me back around 25 years to when I was in a similar situation building a GD427.

I think you are right - there will also be a small terminal for the charge warning light (brown & yellow wire usually IIRC) Richard

Defender 90 SVX

29th Dec 2019 7:01pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6688

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

There are markings on the body - the one at the bottom is marked W which is the tacho output.

The larger diameter stud will be the main connection to the battery (typically done as a cable to the starter) - it should have B+ near it.

The smaller diameter stud is probably for the dash warning light, it should have D+ near it.

There is also a male spade on the left of the photo but I can’t make out the marking.

Is there a model number on the alternator anywhere?

1988 90 Td5 NAS soft top

2015 D90 XS SW

29th Dec 2019 10:29pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6688

The alternator’s ground reference is to the engine block via its fixings, not normally a separate cable.

1988 90 Td5 NAS soft top

2015 D90 XS SW

29th Dec 2019 10:30pm

boxoftricks

Member Since: 06 Feb 2019
Location: Home Counties
Posts: 748

Martin wrote:
There are markings on the body - the one at the bottom is marked W which is the tacho output.

The larger diameter stud will be the main connection to the battery (typically done as a cable to the starter) - it should have B+ near it.

The smaller diameter stud is probably for the dash warning light, it should have D+ near it.

There is also a male spade on the left of the photo but I can’t make out the marking.

Is there a model number on the alternator anywhere?

Thanks Martin. No mode number on it, the stickers have worn blank. Really appreciate your advice

29th Dec 2019 10:45pm

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