P101-L-3 Voltage boost harness for GM 4 pin regulators for a 1.5 volt increase for Lithium batteries


2 reviews Write a Review


Bulk Pricing:
Buy in bulk and save

This voltage boost harness fits alternators with a GM 4 pin regulator. The 1.5-volt increase has only been tested on the 4 pin regulators used in Mechman Alternators. If your current 4pin equipped Mechman Alternator voltage is warm/resting at 14.6 volts, this harness will net just over 16 volts in the same temperatures. Ambient temperatures will affect output. Warmer environments, less voltage. Colder environments, more voltage. Please ensure your added items such as car audio amplifiers are capable of handling the higher voltage as to not damage them or go into a protect mode. Please ensure you have proper belt grip on your alternator as this will increase resistance and will only make any belt slip you currently have MORE noticeable.

Different brands or lower quality sourced regulators can have less or more voltage change. The yellow wire gets connected to an ignition switched 12V+ source to turn the alternator on and off with ignition and the blue wire with ring terminal gets connected to the alternators threaded output stud. This harness can be used with engine swap applications where the stock alternator harness is not available, and you just need a way to turn the alternator on and off through a 12v switched connection.

This harness may also be used WITHOUT THE BLUE WIRE CONNECTED as previously stated if you are currently running a regular battery but plan to upgrade later to a Lithium battery later in your build.

NOTE: This unit is NOT FOR USE ON STANDARD 12V AGM BATTERIES. This module will increase the charging voltage by 1.5 Volt and WILL DAMAGE AGM batteries. Please check with your Lithium battery manufacturer to verify the proper charging voltage before installing this module! Not all Lithium type chemistries require higher voltage charging!

Videos Hide Videos Show Videos

2 Reviews Hide Reviews Show Reviews

  • 5
    1.5 boost

    Robert Christman | 24th Mar 2024

    I currently have 3 320 mechman alts for my audio build and needed a way to boost my alts with out spending a lot of money, these work perfect plug and play!! I connected the diodes to a rocker switch so I can turn on when needed and it works perfect.

  • 5
    P101-L-3 harness

    Joseph Mendenhall | 26th Sep 2023

    This plug works great. I plugged in and connected to the fuse box, and voltage went straight to 16.4. Make sure you’re running lithium and that your vehicle can take such a high voltage. My vehicle is a 2011 Escalade.