following applications: * Dual battery systems. * Where vehicle is subjected to constant short trips that leave cranking battery in a low charge state. * When vehicle is infrequently driven. * High performance engine modifications. * High power audio systems, get the most from your expensive amp. * When replacing a conventional lead acid battery with a full type. The MK3 version is the latest offering from HKB electronics and differs from all other diode booster units in that it is the only device of its type available that incorporates an auto resetting PTC electronic fuse. The PTC device incorporated in the MK3 offers far better circuit protection than both the OEM fuse it replaces and all other types of voltage boosters. Should an electrical fault develop in the vehicles wiring other types of booster diodes will be destroyed and need to be replaced, this is not the case with the MK3 unit, in the event of an electrical fault occurring, the PTC device in the MK3 detects the excessive current flow and turns off preventing damage to the booster unit, the vehicles wiring, and alternator. Once the electrical fault has been removed the PTC device automatically resets and the booster unit will resume normal operation. This unit has distinct advantages over other similar products: * Specifically designed for Alternator voltage boosting applications, electronic components have been carefully selected after extensive testing to ensure best possible safe voltage gain is achieved. * Only unit available incorporating PTC electronic fuse protection, the PTC device offers unparalleled circuit protection and protects both the booster, the vehicles wiring and alternator in the event of a fault condition occurring in the vehicles electrical system. * The electronics devices are fully encapsulated epoxy resin prior to package assembly ensuring superior water, moisture & mechanical protection. * Units are available in mini blade 5A, 7.5A & 10A, a 7.5A standard blade package. For a micro blade package see my micro blade sales. Unlike inferior copies where you may need to modify the device or your fuse box to fit, or where they sit above the fuse socket, all HKB electronic package types plug fully into the fuse socket, and are fully supported in the fuse box. You do not need to modify your fuse block or the device to fit, it simply plugs straight in. Full DYI instructions are included. This unit is plug and play, simply replaces the alternator voltage sensing fuse in the main fuse box of your vehicle and still maintains the original fuse protection, full DYI instructions included. Units have been tested over many thousands of Kilometres with no adverse effect on vehicles electrics or batteries having been found. However as with all aftermarket products, this unit is to be used at purchases own risk, no liability will be accepted for any damage cause by use of this unit. Cheers, HKB Electronics Note: Please read the following: 1/ Please specify vehicle model or fuse type when making pay, if not specified a 7.5A fuse package will be supplied. 2/ Buyers please ensure item is suitable for your use before buying, if your unsure of item suitability please contact me before buying. 3/ Booster can't be used on the 2.8Ltr Prado & 2.8Ltr Hilux motors.