HD Second / Twin Alternator Wiring Kit, GL1112

£114.00 inc. VAT

1 in stock

SKU: GL1112 Category:


1 x 2nd Alternator wiring kit, Heavy Duty.

Part Number :- GL1112, HD Second / Twin Alternator Wiring Kit

Manufacturer :- Gwyn Lewis 4×4

Fits :-  Defender, Discovery RRc that you have fitted a 2nd alternator to the engine.

Weight :- 1.4KG

This kit consists of :-

  • 1 x Heavy Duty wiring 25mm square main charge cable 3mtr.
  • 1 x Alternator Earth Cable 25mm square 300mm.
  • 1 x 12v Warning Light
  • 1 x 12v 4 Pin Relay.
  • 1 x Relay Holder.
  • Cable ties
  • 1 x Fitting Guide.

This wiring kit is to wire up your 2nd Alternator you have fitted, the main cable that goes from the Alternator to the Battery is 3mtr long and 25mm square, it is heavy duty, see picture 2 as it shows the cable against a pencil and a AAA battery to show how thick it is, it has everything you need to wire your 2nd battery and alternator.

Wiring :-
The kit is supplied with a wiring diagram and this can be download in my Fitting instruction.
Earthing the alternators is very important in my opinion, this is how you get maximum charge out of your alternator, high output alternators can’t always earth properly through the bolt holes, I even earth the standard alternators as the mountings are bolted to a painted engine block and rust and corrosion over the years will cause a poor earth.
What you must remember is the batteries are just an electric storage tank, its the alternators that do the hard work, the quicker you can charge the batteries the more power you will have, this is why my alternator wiring kits are very heavy duty as well.
Fitting a relay as a secondary ignition is important in my opinion due to you having 2 wiring circuits so it keeps everything separate.
All this can be found on my Alternator Wiring Kit.

See HERE for a youtube video of my Challenge truck, you will see how hard the winch can pull when wired properly. This one uses a Gigglepin GP82 winch, 2 x 12v Bowmotor 1, two off my HD Winch Wiring kits, one for each motor, two Albright Solenoids, one for each motor, two yellow top optima batteries charging through my second alternator which is 12v 100Amp. All connections are good and nothing gets hot, I can also connect my 3rd battery to the winch batteries when winching, this will then give 200amp of charging current.

A wiring diagram is supplied with each kit, a PDF copy can also be downloaded HERE.

Additional information

Weight 1.4 kg