can this pulse 12v , would it be ble to pulse 12v injector for cleaning ?

The voltage of your injector is between our controller voltage range (10~55V). If your injector is with a DC brush motor and the rated current is below the 60A, HARMNEE pwm motor speed controller will fit for your injector. The rated current is equal to the rate of power divided by voltage 12V.

Why is there a 3 way switch for this?

one is for turning off the motor and the other two are for forward and reverse.

Can it be used with arduino to control motor speed and direction?

I can't imagine why not as long as the Arduino project meets the volt and amp capacities of the Controller.

Lemon? Two right most terminals wired to 20V battery but the voltage across the two left most terminals always 20V no matter the % of pot adjustment.

unplug the pot and connect a meter to center leg and either side legs and check ohms clime as you turn the knob. Make sure all connections are correct. If pot works then controller is bad.

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PWM DC Motor Speed Controller, DC 10-55V/60A, LED Display Stepless DC Motor Speed Controller with Adjustable Potentiometer and Forward-Brake-Reverse Switch

Product ID: 378173956

Details

Brand
HARMNEE
Colour
With Display
Item weight
240 Grams
Material
Metal
Product dimensions
7.9L x 11.4W x

⚡DC 10-55V input range

🔋60A max current capacity

🌡️Aluminum shell for heat dissipation

Description

⚙️ Master your motor’s speed with precision and power — don’t get left behind!

POWERFUL VERSATILE - Handles up to 60A max current and supports forward, brake, and reverse motor directions seamlessly.
PLUG PLAY SIMPLICITY - Easy wiring and intuitive switch design make upgrading your DC motor system hassle-free and reliable.
PRECISION SPEED CONTROL - Stepless potentiometer lets you dial motor speed from 0-100% with smooth, exact adjustments.
CLEAR REAL TIME FEEDBACK - Bright LED display shows exact motor speed percentage, so you’re always in control.
STAY COOL UNDER PRESSURE - Robust aluminum enclosure with ventilation holes ensures optimal heat dissipation for long-lasting performance.

The HARMNEE PWM DC Motor Speed Controller offers a wide input voltage range of 10-55V and supports up to 60A max current, making it ideal for precise speed regulation of DC brush motors. Featuring a stepless potentiometer and LED display, it provides smooth, accurate speed adjustments from 0 to 100%. Its durable aluminum enclosure with ventilation ensures excellent heat dissipation, while the forward-brake-reverse switch adds versatile motor direction control. Perfect for professional-grade motor upgrades and projects requiring reliable, fine-tuned speed management.

Specifications

ASIN	B089273KVZ
ASIN	B089273KVZ
Best Sellers Rank	#239,734 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #327 in Electrical Motor Controls
Brand Name	HARMNEE
Color	With Display
Customer Reviews	4.2 4.2 out of 5 stars (461)
Customer reviews	4.2 4.2 out of 5 stars (461)
Date First Available	26 May 2020
Display Type	LED
Item Dimensions L x W x H	7.9L x 11.4W x 3.6H centimeters
Item Weight	240 Grams
Item model number	Standard 10-55V/60A Max
Manufacturer	HARMNEE
Manufacturer	HARMNEE
Material Type	Metal
Model	Standard 10-55V/60A Max
Part Number	Standard 10-55V/60A Max
Product Dimensions	7.8 x 11 x 3.61 cm; 240 g

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