Do I install this before or after a 100 amp bus prewired in my vehicle?

It depends which battery you want to power the bus, and how the bus is wired. If the bus is connected in between both batteries, I would put the isolator before the bus to only drain the accessory battery when the vehicle is off. Once again, depends on how the bus is wired though.

Is it better to leave the 2 battery connected all the time or its better to disconnect the auxiliary battery if i choose to use a switch

The purpose of the Stinger SGP32 200 AMP Relay is to provide an electronic "switch" that can connect two batteries (or battery systems) at the control of a 1A, 12V signal. In typical use, the relay's signal input is attached to your vehicle's Accessory On, Ignition On or Engine Run signal. In this way, your two batteries are automatically connected by the relay when your vehicle is on and disconnected when your vehicle is off. You could add 1 or more additional manual switches to provide a manual override to the automatic relay.

What gauge wire is recommended?

You can search google for "Wire Gauge Amps Chart" and that will provide more detailed information on what size wire gauge is required for your specific installation. But I would definitely recommend using 1/0awg Oxygen-Free Copper (OFC) power wire if your components will be drawing anywhere near 200 amps.

I have a 210amp alternator will this size work for me or would in need to go bigger? Am i also capable of also using this as a relay without 2 batterys

1. Your relay capacity should match your alternator, not your load. So you theoretically need a minimum of 210 amp relay. 2. Yes. It is basically just a solenoid that isolates one terminal from the other until it is activated.

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SGP32 High-Current 200A Car Audio Dual Battery Isolator & Relay

Product ID: 10263753

Details

Connector Type
Screw
Contact Material
Copper
Contact Type
Normally Open
Current Rating
200 A
Mounting Type
Chassis Mount

⚡200A continuous current power

💧Water-resistant phenolic plastic

🔋100,000 mechanical cycle life

AR$265008

Duties & taxes included

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Description

🔌 Power your ride like a pro—never miss a beat or a charge!

BATTERY LIFE MAXIMIZER - Prevents primary battery drain by isolating secondary batteries, extending your battery’s lifespan and reliability.
BUILT TO LAST 100 K CYCLES - Engineered for durability with a 100,000 mechanical cycle life—dependable performance for the long haul.
HIGH CURRENT POWER TRANSFER - Delivers up to 200A continuous and 500A surge current—power your audio and accessories without compromise.
UNIVERSAL 12 V COMPATIBILITY - Seamlessly integrates with any vehicle alternator or charging system—no compatibility worries.
MARINE GRADE WATER RESISTANCE - Phenolic plastic housing shields your isolator from moisture, perfect for off-road and powersports adventures.

The SGP32 High-Current 200A Car Audio Dual Battery Isolator & Relay by Stinger is a robust, universal 12V solution designed to protect and optimize your vehicle’s electrical system. Featuring water-resistant phenolic plastic construction, it’s ideal for marine, powersports, and off-road use. With a continuous current rating of 200A and surge capacity up to 500A, it ensures reliable power delivery while isolating your secondary battery to prevent primary battery drain. Built to endure 100,000 mechanical cycles, this isolator guarantees long-lasting performance and peace of mind for powering your car audio and accessories.

Specifications

ASIN	B001HBYXVS
Best Sellers Rank	#27,948 in Automotive ( See Top 100 in Automotive ) #25 in Automotive Replacement Accessory Power Relays
Brand Name	STINGER
Coil Voltage	12 volts
Connector Type	Screw
Contact Current Rating	200 A
Contact Material	Copper
Contact Type	Normally Open
Current Rating	200 A
Customer Reviews	4.6 4.6 out of 5 stars (1,568)
Global Trade Identification Number	00609098796019, 00609098797788
Included Components	Stinger
Item Highlight	Universal compatibility, 100k mechanical cycle life, water-resistant design for marine or powersports stereos & accessories
Item Type Name	SGP32
Item Weight	1.4 pounds
Manufacturer	Stinger
Maximum Switching Current	1 A
Maximum Switching Voltage	12 volts
Minimum Switching Voltage	12 volts
Model	SGP32
Mounting Type	Chassis Mount
Number of Items	1
Number of Packs	1
Operation Mode	Automatic
Part Number	SGP32
UPC	609098797788 609098796019
Unit Count	1 Count
Warranty Description	1 year
Wattage	12 watts

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