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.

PriorityStart! vs. AlwayStart: Common Questions

What is AlwayStart, and how does it compare to PriorityStart!?

AlwayStart is an upcoming automatic battery disconnect product currently in presale — as of this writing, it is not yet available for purchase. Like PriorityStart!, it is designed to monitor battery voltage and automatically disconnect the battery to prevent a full drain. If you've been researching AlwayStart and need a solution now, PriorityStart! is an established, proven alternative that ships immediately.

Is PriorityStart! available to buy today?

Yes. PriorityStart! is available now and ships from our US warehouse. It has been on the market for years with a strong track record across automotive, marine, equipment, and emergency vehicle applications.

How does PriorityStart! work compared to AlwayStart?

Both products automatically disconnect your battery when voltage drops to a level that would leave you stranded, then reconnect when you're ready to go. PriorityStart! disconnects at 11.7 volts and reconnects when you activate any accessory — tap the brake, flip a light switch, and the unit reconnects instantly. The standard ProMax handles up to 1,000 starting amps; the Heavy Duty ProMax H.D. handles up to 1,600. It works with both top-post and side-post batteries and supports 12V and 24V systems.

Does PriorityStart! require any maintenance?

No. Like AlwayStart claims for its product, PriorityStart! is fully automatic and requires no ongoing maintenance, no buttons to push, no timers to set. Install it once and it works in the background every time your vehicle is parked.

Common Questions About PriorityStart!

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.