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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Stinger SGP32 High Current 200-Amp Battery Relay & Isolator for Most Vehicles, Water-Resistant Design for Marine & Powersports, Handles up to 500A Surges, Dual Battery Isolator for Car Audio Systems

Product ID: 10263753

Details

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

⚡200A continuous power

💧Water-resistant phenolic build

🔋500A surge capacity

AR$265709

Duties & taxes included

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Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Power your ride like a pro—never settle for less!

HIGH CURRENT HANDLING - Delivers up to 200 amps continuous and 500 amps surge for peak performance.
DUAL BATTERY ISOLATION - Protects your primary battery while powering secondary systems like premium car audio.
LONG LASTING DURABILITY - Engineered for 100,000 mechanical cycles to keep you powered season after season.
UNIVERSAL 12 V COMPATIBILITY - Seamlessly integrates with any vehicle charging system—no compromises.
MARINE GRADE WATER RESISTANCE - Phenolic plastic housing shields your relay from moisture and corrosion.

The Stinger SGP32 is a robust 200-amp battery relay and isolator designed for universal 12V vehicle compatibility. Its water-resistant phenolic construction makes it ideal for marine and powersports environments, while its 500-amp surge capacity ensures reliable power delivery. Perfect for isolating dual battery systems, it extends battery life and supports high-demand accessories like car audio systems with a proven 100,000-cycle mechanical lifespan.

Specifications

ASIN	B001HBYXVS
Best Sellers Rank	#18,728 in Automotive ( See Top 100 in Automotive ) #14 in Automotive Replacement Accessory Power Relays
Brand Name	STINGER
Coil Voltage	12 Volts
Connector Type	Screw
Contact Current Rating	200 Amps
Contact Material	Copper
Contact Type	Normally Open
Current Rating	200 Amps
Customer Reviews	4.6 4.6 out of 5 stars (1,560)
Global Trade Identification Number	00609098796019, 00609098797788
Included Components	Stinger
Item Type Name	SGP32
Item Weight	1.4 Pounds
Manufacturer	Stinger
Maximum Switching Current	1 Amps
Maximum Switching Voltage	12 Volts
Minimum Switching Voltage	12 Volts
Model	SGP32
Mounting Type	Chassis Mount
Operation Mode	Automatic
Part Number	SGP32
UPC	609098797788 609098796019
Unit Count	1.0 Count
Warranty Description	1 year
Wattage	12 watts

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