I am wiring to a vehicle temp gauge. There are no ground wires to/from gauge. Would the ground wires from this unit just be grounded to the vehicle?

I don't really know but, although electrically the negative side of both the input and output could be connected to (auto) chassis ground, I think you would be safer to buy one specifically designed for automotive use.

Correct wiring to get amp/subwoofer stop popping?

Just put a toggle switch with a fuse..just 3 wires on the switch..power,ground and the remote wire that turns on the amp..before you start the engine make sure your toggle switch is off, after starting turn on your switch and your radio will play without popping noise..always turn off your switch before you stop your engine..

Will this work to convert a 12v aftermarket backup camera to a 6v oem radio? 2009 toyota camry xle. thx

Why would you use voltage from a backup camera when it only works in reverse or I don't understand the setup

I don't need negative output, shall i just leave it or still need to ground it?

You have to have a ground to complete the circuit

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12V to 5V DC Converter Car Power Voltage, Waterproof DC 6.3-22V 12V Step Down to 5V 3A 15W Voltage Regulator Buck Converter Power Supply Step-Down Module Compatible with Vehicle Car Truck Volt

12V to 5V DC Converter Car Power Voltage, Waterproof DC 6.3-22V 12V Step Down to 5V 3A 15W Voltage Regulator Buck Converter Power Supply Step-Down Module Compatible with Vehicle Car Truck Volt

Product ID: 478707874

Details

Brand
DORHEA
Colour
black
Input voltage
12 Volts
Item dimensions L x W x H
15.9 x 7.9 x 1
Item weight
0.64 Ounces

⚡3A Output Current

💧Waterproof Design

🔒3 Safety Protections

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Power Your Adventures with Confidence!

BUILT TO LAST - Waterproof and shockproof for ultimate durability.
POWER UP YOUR RIDE - Transform your vehicle's power supply effortlessly!
SMART SAFETY FIRST - Equipped with over-current, over-temperature, and short circuit protection.
HEAT MANAGEMENT MASTERY - High conversion efficiency with low heat generation.
VERSATILE COMPATIBILITY - Perfect for a wide range of devices from GPS to LED lights.

The 12V to 5V DC Converter is a robust voltage regulator designed for vehicles, offering a waterproof and durable solution for powering various devices. With an input voltage range of 6.3V to 22V and a reliable output of 5V at 3A, this converter ensures high efficiency and safety with multiple protection features.

Specifications

ASIN	B07Y2V1F8V
Best Sellers Rank	#143,242 in Electronics ( See Top 100 in Electronics ) #1,382 in International Power Adapters
Brand	DORHEA
Color	black
Customer Reviews	4.6 4.6 out of 5 stars (370)
Input Voltage	12 Volts
Item Dimensions	15.9 x 7.9 x 1 centimeters
Item Weight	0.64 Ounces
Manufacturer	Dorhea
Mfr Part Number	15763-1
Model Number	15763-1
Number of Outlets	1
Output Voltage	5 Volts
Plug Type	Type A
UPC	701715427211

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