PriorityStart! ProMax HD 12V Car & Truck Automatic Battery Start Protector
Item #: 12V-PROMAX-HD   |    In Stock

zoom in

PriorityStart! ProMax HD 12V Car & Truck Automatic Battery Start Protector

Item #: 12V-PROMAX-HD   |  In Stock

Today's Price: $129.95
Free Shipping! Free Shipping

Price: $129.95

Best Value
Free 2-Day Shipping
1 Year Factory Direct Warranty
Brand New
100% Compatibility
Secure Transaction

Product Specifications for PriorityStart! ProMax HD 12V Car & Truck Automatic Battery Start Protector

BM Part #: 12V-PROMAX-HD
Voltage: 12 Volt
Length: 5"
Width: 3"
Height: 1.25"
Shipping Weight: 3.00Lbs
Warranty: 1 Year Factory Direct
Product Manual: Download
  • Handles over 1600 starting amps.
  • Handles approximately 400 continuous amps.
  • Disconnects at 11.7V; times out after approximately one (1) minute.
  • Reconnects with 0.2mV load change (brake pedal, light switch, etc.).
  • High intensity LED light indicates connect/disconnect status.
  • Temperature range: -40°F to +185°F.
  • This item is covered by the Replacement Only Return Policy.
  • PriorityStart! 12V ProMax H.D. provides even stronger Automatic battery protection for heavy duty vehicles and multiple accessory (2way/CB radios, radar, GPS dual batteries etc.) applications
  • Heavy duty increases on all internal components, circuitry and materials, providing greater strength and durability to a wider range of vehicles and applications
  • Designed to handle 1600 starting amps and up to 400 continuous amps providing heavier load capacity, Top high intensity LED indicates connect/disconnect mode
  • 20 Years Same proven technology Automatically Disconnects any drain on battery when engine is off, then Automatically Reconnects with small load change (put foot on brake pedal, operate light switch, etc.) Do-It- Yourself Install.
  • No buttons to push, no raising the hood, no remote to carry and no hard wiring no down time, no lost man hours, no damaged alternator or damaged electrical system. NO DEAD BATTERY!

Product Description

Free Standard Shipping!

Order today and receive free standard shipping on your PriorityStart! ProMax HD 12V Car & Truck Automatic Battery Start Protector. Only valid in the contiguous 48 states and not valid with any other offer.

PriorityStart! a TOTALLY AUTOMATIC 12 or 24 volt Electro-Mechanical computerized on/off battery protection system 20 years proven technology. Simple Do-It-Yourself 3 easy step installation. Stops battery from going dead, preventing damage to battery, alternator, and electrical system (surge protection). Monitors battery voltage when the engine is off. If battery voltage drops below 11.7V (23.6V for 24V model) for any reason, PriorityStart! Automatically Disconnects the drain, leaving starting power! To start the engine, simply operate brakes, lights, accessories, (bilge pump on boat) any small load change (0.2mV) and PriorityStart! Automatically Reconnects, you can start the engine. No raising the hood, No remote to carry, No button to push, No Dead Battery. The PriorityStart! 12 volt ProMax battery protector pays for itself the first time it saves a battery. A dead battery costs time, money, and permanently damages the battery. Protect your battery's life and power with PriorityStart! See each model for more specifics.

Current models include LED light.

Easy to Attach!

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

Specially designed for Law Enforcement, Fleets, Utility, Emergency, and Security vehicles with multiple accessories. PriorityStart! 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 1600 “starting amps”.

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

PriorityStart! 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! 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

What improvements does the PriorityStart! HD have over the original 12V-PROMAX?

  1. 1600 Starting Amps, 400 Continuous Amps.
  2. Contact disk upgrades:
    • Contact disk approximately 60% area increase for more load carrying capability.
    • Spline gear and holding nut increased approximately 60% providing heavier load carrying capability, thus decreasing strain and stress.
  3. Jack screw increased approximately 40% to provide heavier load carrying capability.
  4. Busses increased approximately 30% to provide more load carrying capability.
  5. Ground wire connector thicker and stronger allowing use on heavier vehicles.
  6. Top post contact material increased and raised to improve new GM connections.
  7. Gear cover protects from outside debris, the single solid cover is strong and durable and suppresses normal gear noise.
  8. Motor cover protects from outside debris, the single solid cover is strong and durable.
  9. High intensity LED light, moved to top of unit.
  10. Redesigned circuit board, with room for future expansion.

Rate this description

Did you find the information on this page useful? Let us know!

Thank you for your feedback!

Customer Reviews

12 Reviews | 4.9 out of 5
5 stars (11)
4 stars (1)
3 stars (0)
2 stars (0)
1 star (0)
Would recommend this product.
What our Customers are saying
Priority Start
May 22, 2018
by on May 22, 2018

I have a car that has a parasitic drain that I have been unable to find. I was doubtful when I purchased the priority start but I am so pleased with it. The car starts every morning even though the battery has drained to the point every thing is dead. Touch the brake turn the key and the car starts instantly. Highly recommend it

Would recommend to a friend?
Bought 3
February 12, 2018
by on February 12, 2018

I bought 3 of these and they do perform as said and are worth the funds paid to use it,If you have a short that is intermittent in your electrical system this device will isolate your battery,so that if it drains the battery down to 11.7 volts it will isolate the battery and all you have to do is turn on the ignition switch and tap the brake and start your engine.You will not be caught out in the middle of nowhere again with no one around again to jump start your car. On a side note,it will not keep a battery that will not hold a charge from going down,it requires for the battery to be able to hold a charge,this device just prevents an outside sourse from discharging the battery.

Humble Texas
Would recommend to a friend?
working very good
March 25, 2016
by on March 25, 2016

working very good

Would recommend to a friend?
Very happy with this well built part
January 5, 2016
by on January 5, 2016

It performs as they described and its built well.

Would recommend to a friend?
October 1, 2015
by on October 1, 2015

No more dead battery in the morning due to parasitic drain, PriorityStart works exactly as advertised! Highly recommend!

West Jordan, UT
Would recommend to a friend?