Just got done installing my Power Magic Pro (Battery Discharge Prevention Device) to support the install of my BlackVue DR650GW HD 2 Channel Dash Camera. I was extremely uncomfortable following the directions that directed us to go through the passenger side firewall (right next to the DC to DC 400 VDC 85KW Inverter that feeds the Low Power DC Battery 12VDC.
Here is the option I chose:
1. Remove the rear funk cover parallel to the windshield.
2. Zip tie the Power Magic Pro near in between fuse Panel #2 and fuse panel #3 (see picture)
3. Jack the car up and remove passenger side wheel and wheel well liner (5 quick disconnects and one 12 MM bolt)
4. Move wheel well liner out of the way
5. find the conduit that run the long axis of the car parallel to the High Power Battery (see picture)
6. Remove passenger side skid plate and drill one hole through skid plate 2 inches back from the door hinge.
7. Fish a coat hanger down the conduit to connect to the wire that has been fed into the passenger side wheel well.
8. Pull coat hanger back with wire connected - you are now in the passenger compartment and have worked your way around the firewall.
9. Connect the accessory wire "Trigger" to #F75 (Power Steering) in fuse box 3 and connect constant "battery" wire to #F54 (Open) in fuse box #2.
10. Connect ground wire to location in picture.
Hard part is over - reassemble and test for power.