PriorityStart! 12V ProMax Automatic Low Voltage Disconnect Switch
Item #: 12V-PROMAX   |    In Stock

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PriorityStart! 12V ProMax Automatic Low Voltage Disconnect Switch

Item #: 12V-PROMAX   |  In Stock

Today's Price: $124.95
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Price: $124.95

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Free 2-Day Shipping
1 Year Factory Direct Warranty
Brand New
100% Compatibility
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Product Specifications for PriorityStart! 12V ProMax Automatic Low Voltage Disconnect Switch

BM Part #: 12V-PROMAX
Voltage: 12 Volt
Length: 5"
Width: 3"
Height: 1.25"
Shipping Weight: 3.00Lbs
Warranty: 1 Year Factory Direct
Product Manual: Download
  • This item is covered by the Replacement Only Return Policy.
  • No more dead batteries!
  • Automatically Disconnects; any drain on the battery (when engine is off), even a short, leaving starting power, NO dead battery!
  • Automatically Reconnects; simply put foot on brake, or operate light switch, any small load change and start the vehicle. No button to push, or raising the hood.
  • Do-it-yourself installation 3 easy steps - No hard wiring. Easy to attach; Connect your vehicle positive cable to PriorityStart! Attach PriorityStart! Cable to your positive post. Attach the ground wire to the batteries negative post-that's it!
  • 20 years proven technology protecting vehicle battery alternators, electrical system, your family and your wallet, used by thousands of law enforcements, utilities, and fleets, many using 2way/CB radios, radar, GPS, Dual batteries, chargers, TV, monitors etc.

Product Description

Free Standard Shipping!

Order today and receive free standard shipping on your PriorityStart! 12V ProMax Automatic Low Voltage Disconnect Switch. Only valid in the contiguous 48 states and not valid with any other offer.

Protect your batteries from parasitic drain!

Current models include LED light.

This PriorityStart! battery protector is specially designed for Law Enforcement, Fleets, Utility, Emergency, and Security vehicles with multiple accessories. PriorityStart! 12v battery protector is an automatic computerized on/off “switching” system protecting battery voltage and starting power. If battery voltage drains below 11.7 volts when engine is off, it automatically disconnects the load. The battery voltage immediately recovers. TO START: just step on brake pedal, starting power is automatically reconnected. Designed to handle 1000 "starting amps".

Easy to Attach!

  1. Connect your existing vehicle positive cable to Priority Start
  2. Attach the PriorityStart! 12v battery protector cable to your battery's positive post
  3. Attach the ground wire to the battery's negative post

Often multiple accessories mimic “engine run”. The Pro-Series is specially designed to handle multiple accessory loads, utilizing higher value electrical components to monitor “engine run” when the engine is off.

Pro-Series is successfully being used in vehicles with:

  • 2 way/CB radios
  • Radar Systems
  • GPS
  • Cell phones
  • Computers
  • Flashlight Chargers
  • Mobile Equipment
  • Dual batteries
  • Hi-Amp Stereo Systems
  • Mobile T.V

PriorityStart! battery protector is an electronic cut off switch. It will not charge or maintain a battery.

Have a question regarding use of this item? Contact PriorityStart directly for installation or technical support. They can be reached at (800) 780-8276

View Parallel Dual Battery Installation Instructions

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Cross Reference

The PriorityStart! 12V ProMax Automatic Low Voltage Disconnect Switch has been cross-referenced to be compatible with or replace these OEM part numbers and models:

Customer Reviews

88 Reviews | 4.7 out of 5
5 stars (71)
4 stars (13)
3 stars (1)
2 stars (1)
1 star (2)
Would recommend this product.
What our Customers are saying
Tired of Having a Dead Battery on Seldom Used Box Truck at Non-Profit!
June 29, 2023
by on June 29, 2023

After repeated jump starting and premature battery replacement caused by a parasitic voltage drain, I finally installed the PriorityStart! 12V ProMax Automatic Low Voltage Disconnect Switch. It was easy to install and so far has worked great! The truck has started when needed even after several weeks of no usage.

Lauren, SC
Would recommend to a friend?
Great. Unit... Life saver
July 23, 2022
by on July 23, 2022

Doing the job I expected. So far working well.

Would recommend to a friend?
ProMax Protector Works
May 3, 2021
by on May 3, 2021

I have a parasitic battery drain some where in my electrical system that has yet to be located. I easily installed the ProMax Battery Protector and it works. No longer do I have a completely dead battery because the Protector temporarily disconnects the battery from the main electrical system until I trigger it to reconnect. My battery is protected whether I am able to find the parasitic drain or not.

North Carolina
Would recommend to a friend?
Stops Dead Batteries
December 22, 2020
by on December 22, 2020

This product is great and we use it on customer vehicles when they have a slow draw that drains their batteries. Highly recommend!

Would recommend to a friend?
Love PriorityStart!!
June 28, 2020
by on June 28, 2020

Like the 1st one so much I just bought a 2nd for my 2001 toyota 4runner!!! The 1st one totally resolved my parasitic drain issue on my subaru which was a 6 amo drain!! Thanks guys!!

Would recommend to a friend?
Great Great Great
June 25, 2020
by on June 25, 2020

Fixed my car and is easy to install

Would recommend to a friend?
Great Puduct
February 2, 2020
by on February 2, 2020

I love this But! this is a problem this the led connector, it need to be replaced with a nut and Bolt Connector,
on my truck the live cable came off the led connector and almost shorted on the body of the truck, vary dangers,
I went to canadain tire and bought a led post connector with nut and bolt,and it took care of the problem. In all Great Puduct.

Scarborough, On.
Would recommend to a friend?