1 x Twin Alternator Mount & Fan Belt DIY
Part Number :- GL1105, 300tdi Defender, Discovery & RRC Twin Alternator Mount – DIY
Manufacturer :- Gwyn Lewis 4×4
Fits :- 300 Tdi Defender / Discovery / RRc Engines.
Weight :- 2KG
This kit consists of :-
1 x Alternator Mounting Kit.
1 x Dayco Fan belt.
This alternator mount comes fully welded, but will require painting.
This mount allows a second alternator to be fitted to charge auxiliary batteries instead of a split charge system.
An original 300Tdi 12 volt alternator can be fitted or we can supply a high output 12 Volt 100 Amp A127 YLE10113 with 7rib 65mm pulley.
This mount fits in the position of the air con pump and is supplied with a fan belt.
From use in expedition vehicles or in any vehicle where you want to power auxiliary equipment using a second battery, up to more extreme use where you need to maximize charge current on winch challenge vehicles.
What you must remember is your batteries are just an electric storage tank, it’s the alternators that do the hard work, the quicker you can charge the batteries the more power you will have, even with a split charge system you still only have one alternator supplying your electrical system.
Two alternators using separate charging circuits are far better than a split charge system run off one alternator.
With a split charge you must have identical batteries and it helps if they are the same age and in the same condition as well.
Most split charge system are basically just a switch that automatically joins your batteries together in parallel once you start your engine or your main battery starts receiving charge.
Batteries charge in different ways that’s why ideally with a split charge system they should be the same type, age and in the same condition.
With two alternators you have two completely separate charging circuits so different batteries are no problem at all, you could have one high cranking amp starting battery as your main with a deep cycle battery as your second for powering axillary/expedition equipment.
You could manually link both batteries together in parallel to maximise charge current to high current draw equipment such as winches on winch challenge vehicles, this should only be done when drawing large current, charging circuits must be separate during normal use.
By having two alternators, if one went down then you still have another to keep you going.
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.