The Install Bay IB500

500 Amp Battery Isolator and Relay

Product videos

• Battery Isolator and Relay
• 500 Amp
• Prevents Primary Battery Discharge
• Maximizes the Current Transfer
• Extends Battery Life
• Universal 12V Applications

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Product Highlights

• Battery Isolator and Relay
• 500 Amp
• Prevents Primary Battery Discharge
• Maximizes the Current Transfer
• Extends Battery Life
• Universal 12V Applications


Install Bay brand icon

Authorized dealer

  • 500 amp Battery Isolator and Relay
  • Great for isolating a second battery making it dedicated to the stereo system
  • Does not create a voltage drop to the second battery like conventional isolators
  • Prevents primary battery discharge
  • Maximum current transfer
  • Extends battery life
  • Compatible with universal 12V Applications
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Specifications & Details

Battery Isolator Features
Compatible Amperage
500 amps
Isolator Type
Relay (Solenoid)
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Item Details


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Product and How-to Videos

Customer Ratings & Reviews

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Customer Reviews

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Good product

I've only had it for a couple days, but it works great so for. I tested it and lets the volts go through like I need to charge the other battery. When I turn the car on you hear a heavy click, witch I have to say I like to hear. For the price and the amp of the relay it's a good buy. I bought this one, because I want to upgrade the alternator on my car. I wish Sonic sold that too, but maybe some day.

By Tim on September 25, 2011


found this helpful.

Good isolator

Does exactly what it should

By Jacob on August 16, 2011


found this helpful.

Keep Ya Batts From Fighting!

this 500 amp isolator keep all my batteries from killing each other...don't listen to so-called pros that tell you not to use a isolator! its a must for daily driver systems with this three batteries a 6 farad cap big 3 and a stock 120 amp alternator I never drop below 14 volts

By Walter on July 29, 2013


found this helpful.

Does Exactly What I Needed It To Do

My experience is professional. This 500 amp continuous duty relay does not have the voltage drop that a solid state battery isolator has and does a much better job of charging auxiliary batteries through. This one had the highest amperage rating for the price. It clicks on with a very heavy and solid "thunk" like you would expect from a heavy duty solenoid.

You will need to use an AND gate with this relay, or any other such device so that it isn't energized when you have your ignition switch in the start position or the accessories position. I chose this one for its high capacity to insure a much longer contact life.

I will definitely be buying more of these for future RV and high power sound system needs and would most certainly recommend it to a friend or relative.

By Woofers74 on June 2, 2011


found this helpful.

excellent product

I purchased this product about your gall still work fine what's good about it even before I purchase my baby alternator but it looks good still work fine so I left it in the cart still using it in today recommend it to anybody to buy

By Carlos on January 11, 2014


found this helpful.

super battery relay

I purchased one that wasn't as good as this one from another distributor
and it caused a lot of problems when it shorted. it took me a while to find out. I recommended that when installing this item you put in the best to avoid problems in the future and make sure the person that works on your car knows what he is doing because you'll regret it. also the price was great and free shipping can't beat that

By mar'key on October 9, 2013


found this helpful.

solid product

1400 watts of sound system with 250 amp alt with optima yellow top and kinetic batt in trunk. this handles both with ease. really a must for higher powered electronics. Heavy duty unit. Great price for large power handling.

By Michael on May 28, 2013


found this helpful.

Best priced high quality

After 2 years of using this it still works! Best relay isolator I ever used.

By Rick on May 9, 2012


found this helpful.

very solid:

I installed one of these on my 1997 k1500 last year and i have had. On trouble at all. I installed a backup battery and have had the main battery go dead but with this ib500 it kicked the backup battery in
and the truck started right up. These relays DO NOT FAIL!

By DARKSTAR on February 28, 2013


found this helpful.


Works great. You can't even hear it activate. I use it with a relatively low power system but I love to bump my music with the engine off so I installed one of these to make sure I don't kill my main battery.

By Boss on September 18, 2013


found this helpful.

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