2A LED PWM Dimmer with Bypass (pair)

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PWM 12V Dimmer

2A LED PWM Dimmer with Bypass (pair)

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Designed and Made in USA by Diode Dynamics Manufacturing

This is an set dim level 12V PWM dimmer, perfect for automotive use with dimming on the positive channel. Most other dimmers operate by modulating the negative side, which makes it difficult to use remotely in a common-ground automotive environment.

The total current capacity is 2 amps, perfect for LED arrays, angel eye rings, LED bulbs, or other LED components. 9-16V Operating Voltage.

There's also a unique feature included: Instead of a simple input and output, this module has two inputs, DIM and HIGH.

When a signal powers the DIM pin, the module will output the PWM-dimmed signal at 50% brightness. Then, when another signal is connected to HIGH, the module will pass full power through, for full brightness. Each input is protected against reverse current flow, so they won't interfere with each other.

This feature makes the module perfect for LED tail lamps or turn signals. It can be used with any LED ring, bulb, or array.

Here's an example: take the positive 12V wire for any LED. Connect it to the OUTPUT of this module. Connect running light power to the DIM wire, and turn signal power to the HIGH wire. This module does the rest! Your LED will function as a dimmed running light and then light up full power when turn signal is activated.

Whether it's a running and brake light signal, or a running and turn signal, the module will switch between low and high brightness levels perfectly for you, at an adjustable level of brightness.

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  1. Perfect for stop/tail combination Review by Manuel

    I retrofitted my car taillights to LED's. This made the installation so much easier. No need to run dual circuits with dual resistors. Just install this to your factory stop and taillight wires and the tails dim and have full power to the stop lights. I really like the adjustability for the dim. Very small and very easy to install. The instructions could not have been easier to follow. The quality is nice. I've installed them about a month ago and so far so good. Plane to order another couple pairs to redo my front parking/turn signals and to have a backup incase of problems. Highly recommended for your DIY projects. (Posted on 6/8/17)

  2. Fantastic Product ! Review by Bob

    Cheap, high quality, works perfectly.

    I installed LED daytime running lights on my car and they were way too bright.

    This PWM dimmer was the perfect solution. Visually, the LEDs look exactly the same, the only adjustment is the brightness level itself.

    White wire is all I used. Highest brightness is about 50% of using the red wire. Adjustment pot allows all the way down to very dim where the LEDs are barely on.

    Didn't come with a screwdriver, so make sure you have a very small screwdriver, like for glasses.

    Highly recommended! (Posted on 3/27/17)

  3. Excellent product! Review by Victor

    These dimmers worked great for my project,,, I installed a set of LED Reflectors on a 2013 Toyota Venza and when installed they were too bright,,, therefore I used these dimmers which were very straightforward and worked flawlessly ...highly recommended. (Posted on 2/15/16)

Worry-free warranty

  • -Full 3-year warranty on all products
  • -No waiting: we usually send new items out with a return label (US customers only)


You will get quick help from our trained staff for any issues.

All Stage Series products carry a limited 8-year warranty.

For further details, please see our full article.

Domestic (US) Customers

  • - Same-day shipping for all orders placed by 12:00 PM CST (or until 4 PM with rush processing)
  • - USPS, for delivery in 3-5 days (on average)
  • - Express services are available, see exact pricing at checkout
  • - Fully Insured


International Customers

  • - We ship to all countries via standard mail
  • - Usually around $10 for LEDs, or $25 for HIDs.
  • - Choose your service on checkout to see exact prices:
  • - USPS 1st Class: 2-5 weeks
  • - USPS Priority: 1-2 weeks
  • - Express EMS: 1 week
  • - Please email us if you are unsure about shipping to your country.

You will receive updates from our site when your order is shipped, along with a unique shipment number to ensure that your order is correctly accounted for. This allows you to easily reply to us if you have any concerns.

Whether your order is big or small, it is tested through many run cycles, and each bulb is tested before shipment. Every single bulb. Every time. And if anything does go wrong, you can rely on our industry-leading warranty for worry-free replacement.

If you're not happy with your items, we want to make it right. So we have some pretty awesome return policies:


30 day return policy. All customers have 30 days from the date of original order shipment to return items.

Full refund, no fees. At Diode Dynamics, we offer free returns. That means no restocking fees, no administrative fees, and no hassle!

 Free return label. If your original order was over $50, you get a free return label for your items (US customers only). If your order was less than $50 or international, you can send the items back through your preferred method.


Within 30 days: If your original order was over $50, you can get new items shipped to you with a return label (US customers only). If your order was less than $50 or international, we can send you the new items first, but you are responsible for returning the old items.

Within 90 days: Any item can be returned for exchange or store credit within 90 days. The buyer is responsible for the cost of the return shipping, and must first return the old items. We'll still cover the postage for the new items.


Please note: due to the nature of custom acrylic pieces, we cannot offer any refund or exchange for returned custom acrylic items.


To make a return or exchange, please request an RMA, or give us a call. When we get it back, you will be notified and credited appropriately.

Again, all returns must be approved, with an RMA. This is so that we can process your return as quickly as possible when we get it. If you would like to return an item, please Request an RMA. Please include as much information as possible about the reason for return.

Alternatively, you can also send us a message, or give us a call!