Mate was having trouble with his C-Tek charging system not doing the job(in a Navara). The charger needed 13.6 v before it started the charging of the Aux battery & as the "Smart Alternator" was not keeping the main batt at this voltage & the Aux was not being fully charged. Advised him of the "Green wire mod" & this solved the problem & he reports there is no change to fuel consumption or any other problems.