How long are the lengths of wire in this kit?

the ground wire was shorter than I expected, approximately 20 inches as I recall

Can i hook a switch up to this isolator the change wich battery i want to use?

As long as both batteries are in good shape it keeps both charged so you shouldn't need to do that

will this isolator cut off when house battery is fully charged ?

This isolatordesigned to only charge house battery from altnator after start battery reaches a certain voltage and to stop draw on start battery below a specified voltage

My second battery (trolling motor battery) does not ground to anything. Should I ground that to the primary battery or the engine block?

You will need to tie the secondary (trolling) battery to the primary in order to charge. Just follow enclosed directions, applies to any 12V system.

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RANSOTO Dual Battery Isolator Kit 12 Volt 140 Amp Voltage Sensitive Relay Complete VSR Double Battery Automatic Charger Battery Disconnect Switch Battery Isolator 12v

RANSOTO Dual Battery Isolator Kit 12 Volt 140 Amp Voltage Sensitive Relay Complete VSR Double Battery Automatic Charger Battery Disconnect Switch Battery Isolator 12v

Product ID: 166083211

Details

Connector Type
Clamp Crimp
Contact Material
Copper
Contact Type
Normally Open
Current Rating
140 A
Mounting Type
Panel Mount

⚡12V voltage sensitive tech

🔋140A high-capacity relay

🛠️Complete install kit included

Description

🔋 Stay charged, stay unstoppable—power your journey with confidence!

POWER UP WITHOUT LIMITS - Seamlessly charges dual batteries to keep your adventures powered all day.
PLUG PLAY INSTALLATION - No special tools needed—get your dual battery system up and running in no time.
BUILT FOR THE RUGGED LIFE - Shockproof, waterproof, and heat-resistant design built to withstand extreme conditions.
SMART VOLTAGE SENSITIVE RELAY - Automatically isolates batteries to protect your main power source and extend battery life.
VERSATILE VEHICLE COMPATIBILITY - Perfect for RVs, trucks, boats, and SUVs—power your lifestyle wherever you go.

The RANSOTO Dual Battery Isolator Kit features a 140 Amp voltage sensitive relay designed for 12V systems, enabling simultaneous charging and isolation of two batteries. It includes all necessary cables, terminals, and mounting hardware for easy installation without special tools. Built with high temperature, shock, and waterproof materials, it’s ideal for vehicles like RVs, trucks, boats, and SUVs, ensuring reliable power management on the go.

Specifications

Asin	B07YHNFLHK
Best Sellers Rank	#1,292,730 in Automotive (See Top 100 in Automotive) #88 in Automotive Replacement Battery Relocation Kits
Brand Name	RANSOTO
Coil Voltage	12 volts
Connector Type	Clamp, Crimp, Screw, Quick Connect
Contact Current Rating	140 A
Contact Material	Copper
Contact Type	Normally Open
Current Rating	140 A
Customer Reviews	4.4 4.4 out of 5 stars (258) 4.4 out of 5 stars
Manufacturer	ANODIZING RACING
Minimum Switching Voltage	12 volts
Model	RZ084
Mounting Type	Panel Mount
Number Of Items	1
Number Of Terminals	2
Operation Mode	off_none_on
Part Number	RZ084
Unit Count	1 Count
Upc	764823505844
Wattage	3 watts

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