Electrical 2-9
Section 2: Electrical
Electrical Systems Management
Care must be given in deciding what equipment should be installed into a vehicle given the power
demands of the equipment and the power available from the vehicle. A power load strategy should
be developed to minimize the risk of running out of power. Examine the proposed equipment for
vehicle installation. Add up the current requirements. If the current requirements exceed what the
vehicle can reasonably be expected to be able to provide, the battery will begin discharging to
provide the power to the equipment that the generator is unable to provide. After some period of
time, the vehicle will shut off as the battery voltage decreases to a level that cannot sustain
vehicle operation.
There are alternatives that can be considered to minimize system electrical overload. Consider the
current requirements of equipment before it is purchased and installed. For example, modern light
bars and radios use a fraction of the current than units made as recently as 1996. The light bar is
the most power intensive unit installed on most vehicles, considerable attention should be given to
its current requirement. Changes in driver habits can make a difference in the electrical system
load and will impact available power as well. When a vehicle is sitting and no one is in the car,
certain electrical equipment can be turned off until the driver is ready to get back into the vehicle.
Generator Output
The generator for the Fusion Hybrid and MKZ Hybrid are different from those used on the
non-hybrid models. The non-hybrid vehicles have a 110-amp generator.
Vehicle Component Electrical Loads
Vehicle component electrical loads are shown in the table below. Not all features are powered all
the time, so actual vehicle loads on the power supply system will vary.
Note: Smart junction box (SJB) F4 (30A), circuit SBP04 (GN/RD) for the DC/AC power inverter is
at maximum available current limit when the power inverter is installed and used. Do not
splice into these fused circuits.
Component Amps
Base
Miscellaneous base loads 36.1
Cooling
Cooling fan (variable speed) 24.0
Climate Control
A/C clutch 3.7
A/C fan to face — high speed 21.7
(recirculating air)
A/C fan to face — M/H speed 11.9
(recirculating air)
Heater fan to foot — M/H speed 10.7
(fresh air)
(Continued)
2012 Fusion Hybrid, MKZ Hybrid Modifiers Guide, 09/2011
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