What does a dual battery isolator relay do?

It connects a main and an auxiliary battery so the alternator can charge both, while keeping accessories from draining the starter battery. This one is a plain relay, so isolation depends on how you trigger it.

Does it isolate the batteries automatically?

No. It is an electromechanical relay, not a voltage-sensing isolator. You need a switched trigger, such as an ignition feed, to open and close the link.

What are the dimensions?

The housing measures about 7.7 x 4.8 x 7.8 cm. Check clearance in your engine bay or battery box before mounting.

Can it be used as a starter relay?

Yes. It is sold as a 12V car starting relay as well as a battery isolator, so it can switch a starter circuit if its contacts suit the load.

The relay itself. Wiring, fuses, terminals and mounting hardware are not included, so plan those separately.

Is it suitable for a camper or boat?

It works in 12V camper and marine setups, but the plastic housing and lack of sealing mean it should be mounted somewhere dry and protected.

Moluckfu 12V Car Starting Relay Power, Dual Battery Isolator

Best price now

$11.42at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

Moluckfu 12V Car Starting Relay Power, Dual Battery Isolator

Best price now

$11.42at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $11.42 at Walmart on Nov 10.

Our take on the Moluckfu 12V Car Starting Relay Power, Dual Battery Isolator

This is a 12V dual battery isolator relay in a black plastic housing, sized about 7.7 x 4.8 x 7.8 cm. It is meant to link a main and an auxiliary battery so the starter battery is not drained by accessories. It is a basic electromechanical isolator, not a smart voltage-sensing unit, so it suits simple dual-battery setups in cars, vans and off-road rigs. Compared with voltage-sensing isolators, it lacks automatic cutoff logic and needs proper wiring and a switched trigger.

Best forVan and camper dual-battery buildsOff-road and overland accessory batteriesDIY 12V electrical projectsOwners replacing a failed starter relay

Pros

Simple electromechanical design with few parts to fail
Compact black plastic housing fits tight engine bays
Works as a starter relay or a battery link
Straightforward to wire for DIY installers
Handles 12V automotive systems

Cons

No voltage-sensing automatic isolation
No smart charging or monitoring features
Limited published contact ratings
Plastic housing offers little heat shielding
Wiring and fusing are left to the installer

Moluckfu 12V Car Starting Relay Power, Dual Battery Isolator prices at every store

WalmartNew
In stockSold by NexatoryReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$11.42Free shippingChecked Nov 10
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About the Moluckfu 12V Car Starting Relay Power, Dual Battery Isolator

This is a 12V car starting relay, also described as a dual battery isolator. It has a black plastic housing.

The relay measures 7.7 x 4.8 x 7.8 cm.

Color: Black
Material: Plastic
Dimensions: 7.7 x 4.8 x 7.8 cm
Voltage: 12V

Specifications

color: BlackSource

Questions and answers

What does a dual battery isolator relay do?: It connects a main and an auxiliary battery so the alternator can charge both, while keeping accessories from draining the starter battery. This one is a plain relay, so isolation depends on how you trigger it.
Does it isolate the batteries automatically?: No. It is an electromechanical relay, not a voltage-sensing isolator. You need a switched trigger, such as an ignition feed, to open and close the link.
What are the dimensions?: The housing measures about 7.7 x 4.8 x 7.8 cm. Check clearance in your engine bay or battery box before mounting.
Can it be used as a starter relay?: Yes. It is sold as a 12V car starting relay as well as a battery isolator, so it can switch a starter circuit if its contacts suit the load.
What is in the box?: The relay itself. Wiring, fuses, terminals and mounting hardware are not included, so plan those separately.
Is it suitable for a camper or boat?: It works in 12V camper and marine setups, but the plastic housing and lack of sealing mean it should be mounted somewhere dry and protected.
Where is the Moluckfu 12V Car Starting Relay Power, Dual Battery Isolator cheapest?: At Walmart, for $11.42, as of our latest check.