Twin alternator

[Winnie]

If your in Melbourne the blokes at Piranha off road have an output compensator that can increase charge rate by 0.5 volts as well.

Another option anyway...

http://www.piranhaoffroad.com.au/news/index/article/27

I read on this forum once that they are not a good idea? I can't remember why but the person said they are great for newer model Toyotas because their alternator output is so low but no good for our Patrols.