H&S MINI MAX Installation & Operation Manual - Solid Purple Wire

1-888-628-1730   •   Mini Maxx Installation Manual         39

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On any vehicle using 3” or larger lift blocks under the rear leaf pack, it is HIGHLY RECOMMENDED to install 

traction bars. With any added horsepower, failure to do so may result in harsh shifting and may cause premature 

transmission and/or driveline damage.

Keyed ignition source location

Although it is possible to manually power up the Mini Maxx without using a keyed ignition 

source, it can sometimes create communication issues between the Mini Maxx and the 

vehicles ECM. To eliminate these problems, we highly recommend tapping into a 12V keyed 

ignition source to supply power to the Mini Maxx only when the key is in the ON position 

and the vehicles ECM is online. Below you will find a commonly used 12V keyed ignition 

source for your vehicle:

soliD PUrPle Wire

The SOLID PURPLE wire (capped from the factory) 

is found under the drivers side dash. This SOLID 

PURPLE wire is bundled with multiple other capped 

wires near the OBD-II port.

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If your fuse box or wiring looks different than those pictured 

or if you are not getting 12V ignition power from the pictured 

source, you may need to find another 12V keyed ignition source using a test light or multimeter. If possible, find one 

that stays “hot” during engine cranking.

Maxx calibration control

Maxx Calibration Control (MCC) is an advanced engine management software tool that enables 

custom tune editing with your H&S tuning device. With the power to control all aspects of engine 

and transmission management, MCC gives YOU the ability to control how YOUR engine operates! 

When you have exceeded the limits of conventional tuning and want to unleash the power of a 

custom tune, look no further than MAXX CALIBRATION CONTROL 

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Applications may vary by vehicle make and model, please check our website to see if MCC is available for your 

vehicle at www.hsperformance.com/mcc

Unplugging Head Unit

If you unplug your head unit your truck will remain at the last known power level you had it set to.

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High sulfur calibration info found on page 53