PriorityStart! Automatic Battery Disconnect Switches

One Install, and You Stop Thinking About It

Think about what a dead battery actually costs — the service call, the tow, the replacement battery, the lost time. PriorityStart! heads all of that off. It also protects your alternator and your vehicle's electronics from the damage that jump-starting can cause. And because it prevents deep discharge, your battery lasts longer to begin with. Most people find it pays for itself the first time it saves them.

Works on Just About Anything With a 12V or 24V Battery

PriorityStart! works across a wide range of vehicles and equipment — daily drivers, trucks, boats, RVs, ATVs, farm and construction equipment, and emergency vehicles. If a dead battery would cost you time, money, or put you in a bad spot, this is the fix.

You Can Install This Yourself in 15 Minutes

No electrician. No special tools. No hard wiring. PriorityStart! connects directly to your battery's positive cable — top post or side post — in three steps. If you've ever changed a battery, you can install this.

Frequently Asked Questions

How does it know when to disconnect?

PriorityStart! monitors your battery voltage continuously. If it detects a drain — a light left on, a door ajar, a GPS or radio drawing power — and your voltage drops below 11.7 volts for a full minute with the key off, it disconnects the battery automatically. That threshold is carefully chosen: low enough that it won't trip unnecessarily, but high enough to preserve the starting power you need.

How do I reconnect it when I'm ready to go?

Just activate any accessory — tap the brake pedal, flip a light switch, anything like that — and PriorityStart! reconnects on its own. Then turn the key and start normally. That's it.

Will it work on my truck? My boat? My equipment?

Almost certainly yes. PriorityStart! works with 12V and 24V systems and fits most vehicles — cars, trucks, SUVs, boats, RVs, ATVs, tractors, and commercial or emergency vehicles. Check the individual product listings to match the right amp rating to your application. The standard ProMax handles up to 1,000 starting amps; the ProMax H.D. steps it up to 1,600 for heavier-duty needs.

My battery is already dead. Can this fix it?

Unfortunately, no. PriorityStart! prevents a good battery from going dead — it can't bring back a battery that's already damaged or fully discharged. If your current battery is on its last legs, replace it first, then install PriorityStart! to protect the new one. Think of it as insurance for a battery worth protecting.

Is installation really something I can do myself?

Yes — and we mean that straightforwardly, not as a sales pitch. There's no hard wiring involved. The unit connects inline on your positive battery cable, works with top-post and side-post batteries, and most people have it done in 10–15 minutes. If you've ever changed a battery, you can install this.

Does it protect my vehicle's electronics from jump-start damage?

Indirectly, yes — and this is worth understanding. Modern vehicles are full of sensitive electronics that can be damaged by the voltage spike from a jump-start. By keeping your battery from fully discharging in the first place, PriorityStart! eliminates most situations where you'd need a jump at all. That's good for your battery, your alternator, and every computer in your vehicle.