SKU: 3592716468

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

Sale price$30.60 Regular price$34.00
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Description

Mechman P101-L-3 Voltage boost harness for GM 4 pin regulators for a 1.5 volt increase for Lithium batteries*** VOLTAGE BOOST NUMBERS ARE BASED OFF OF STANDARD MECHMAN 14. 8 VOLT REGULATORS*** This voltage boost harness fits alternators with a GM 4 pin plug and is similar to our "plug and play" H104 L harness. The P101 L is the simplified version of the H104 L which makes it great for secondary alternator setups and a cleaner look or engine swap applications. The yellow wire gets connected to an ignition switched 12V+ source to turn the alternator on and

*** VOLTAGE BOOST NUMBERS ARE BASED OFF OF STANDARD MECHMAN 14.8 VOLT REGULATORS***

This voltage boost harness fits alternators with a GM 4 pin plug and is similar to our "plug and play" H104-L harness. The P101-L is the simplified version of the H104-L which makes it great for secondary alternator setups and a cleaner look or engine swap applications. 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 appx. 1.5 Volt and will swell and damage AGM batteries. Please check with your Lithium battery manufacturer to verify the proper charging voltage before installing this harness!

TIPS FOR BEST RESULTS:

1. Ensure you have proper belt grip. If you have a slipping belt currently, increasing voltage will only exaggerate belt slip.

2. Double check all electrical connections for solid and corrosion free terminals.

3. Make sure all lithium battery cells are healthy, balanced and in a proper state of charge.

4. If lithium batteries are in a chargeable state but are on the lower resting voltage, allow your battery to fully charge first. Depending on the size of the battery bank and your alternator amperage this could take 10-15+ minutes.

 

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SKU: 3592716468

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4.3 ★★★★★
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Verified Purchase
Coulton
Carnegie, US
★★★★★ 5
Great deal!
Size: 8 AWG 3 ft per color, Color: Red and Black
Used it to wire up my boat for trolling motor. Heat shrinked everything and went super smooth. Great deal!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 6, 2019
C
Verified Purchase
Chuck
Battle Creek, US
★★★★★ 5
Nice quality wire
Size: 8 AWG 3 ft per color, Color: Red and Black
Very flexible with a nice jacket - appears correctly advertised gauge and pure copper.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 28, 2020
M
M.R.
West Palm Beach, US
★★★★★ 5
The Thick Red and Black Spaghetti of Power
Size: 20FT Black & 20FT Red
If electricity had highways, this would be an interstate. The cable feels substantial, the copper conductors are flexible enough to work with, and the included lugs and heat shrink tubing make installation easier. Great for batteries, inverters, solar systems, RV electrical upgrades, marine projects, and welding setups. Voltage drop stays low thanks to the heavy gauge construction, and the insulation feels durable enough for demanding environments. Overall, a solid wiring kit that inspires confidence when moving serious current.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2026
D
Drew
Lexington, US
★★★★★ 5
Great cable kit.
Size: 20FT Black & 20FT Red, Size: 20FT Black & 20FT Red
Great heavy duty cable. Good thick feeling insulation that looks the real deal. Wire is soft enough to route easily without too much resistance. Appreciate it coming with the lugs and heat shrink instead of you having to source extras. Seems to be truly copper as listed. Great deal for the length if so. Worked for what I needed on my UTV.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 1, 2026
R
Rachel H.
Charlottesville, US
★★★★★ 5
Cheap price for the cable and terminal ends with heat shrink.
Size: 20FT Black & 20FT Red
Good 6 gauge wire, jacket seems sturdy and like it won't crack easily over time like some wire. Comes with all the connectors shown too so you don't need to find end ring connections to terminate the ends. Just need a punch or crimp tool for the terminals but if you already have that then just cut your wire length and add the ends for battery cable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 29, 2026

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