Can this control be used to directly power a rear window defroster (heat wires, big Corvette window) directly, or do I need to use a relay?

Yes, the ThermaSync defroster control can power the rear defroster as long as the current does not exceed 20 amps. The way to tell what current a defroster uses is to measure the resistance at the metal tabs on the sides of the defroster using a multimeter. Let's say the vehicle is 12 volts and the defroster resistance is 2 Ohm , Volts / Resistance gets you Amps. So in this example 12 v / 2 Ohm = 6 Amps. The 2712 TheramSync Defroster Control has three tabs on the back, Power, Ground and "H" for power to the defroster. Connect the wire coming from the H to one side of the defroster and ground the other side of the defroster using the metal tabs along the edges of the defroster. We supply tabs, connectors and a wire harness if needed. The connectors for the tabs on the ThermaSync control comes with the control.

Do i need to buy a relay for switch

No additional relays are normally needed. The 2712 ThermaSync Defroster and Heated Mirror control can power defrosters and heated mirrors. This unit is a timing relay with its own remote switch which can be mounted up to 30 inches away from the control. There are three tab connectors on the back of the units, Positive, ground and "H" which is power out to the heater. All connectors come with the control. Press the button and the unit goes on as indicated by the red operation light on the switch and then times out in the standard ten minutes. - Doctor Defroster, Frost Fighter

Does this come with wiring instructions?

Thank you for your question on the ThermaSync control. Yes, the control comes with full instructions including wiring. There are three pins, Power, ground and "H" going to one of the connectors on the defroster or mirror wire.

Can this control be used for heated towing mirrors on a 2004 suburban 1500 2wd? connected to seo accessory socket under the dash?

Thank you for the question. Yes, the 2712 ThermaSync Defroster control can be used to power heated mirrors. The control has the defroster switch with an LED indicator and tactile activation button. The control automatically switches off at ten minutes just as the rear window on most vehicles. The switch can be mounted up to 30 inches away from the control. While not familiar with a Surban SEO accessory socket, to connect the control there are three pins on the back. Power, ground and the "H" pin which is the hot, power (+) out to the mirrors. Wire the "H" run to the positive side of each mirror, ground the mirriors and that is all there is to it. Normally heated mirrors are not power and ground specific.

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Reviews

J**A

Timed mirror heater control

Purchased to add heated mirrors to an international 4700 that didn’t have that feature. Install was a breeze and it worked exactly as I hoped. Wish the cord from the brain to the button was a little longer as it can affect where you mount it but I made it work and it was a good purchase

3.06.2025

R**G

Worked Well

Installed on a 2005 Chevrolet Silverado WT. I added turn signal and heated mirrors to replace the ultra basic mirrors that came with the truck - no heat, no turn signal, no power adjust, no power fold .This item is used to control the heated mirror portion and works as expected. I installed the switch on the dash to the left of the fog light/cargo light simply because whoever owned the truck before me had already cut a hole there for a toggle switch. The switch wire is plenty long to be able to mount the switch remotely from the control unit.Ultra simple and easy to install. The only thing that slowed me down was peeling off the backing to adhere the switch to the dash. For me, I used a white wire near the fuse box that had power only when the truck had ignition on as opposed to using a RAP style wire. The control unit is located near the steering column for easy access later if needed; also an auditable clicking is nice in this location since it's a bit hard for me to see the switch light on without moving my head bit (again due to my own placement and lack of desire to drill a new hole).

19.05.2020

J**N

Still working

Works well.

31.03.2025

J**E

Worked exactly as advertised

Worked exactly as advertised. Used it to control my aftermarket mirror heaters. Powers on and stays on for 10 minutes, then shuts off automatically until powered on again. Also cuts off if you turn vehicle off before the 10 minutes. Ideal to used and preserve mirror and seat heaters.Pricey but the switch was small and nice (not cheap or tacky) , easily mounted with 2 sided tape, appropriately lighted to indicate off/on. Connections easy and intuitive. Priced it out buying other cheaper (Chinese) modules, but they required timing to be set with jumpers, the instructions were interesting (really bad English), and you still need to buy a switch. Considered using one of my factory slots in the dash to add a momentary contact, but in the end it was only ten bucks cheaper.I am pleased with my decision to spend a little more.I would recommend this unit, and would buy again.

24.11.2019

A**S

It seems to be quality made. I have yet to use it.

It appears to be well made. I still need to wire my mirrors and install the relay.

11.02.2025

D**R

Great Product! Fast Shipping! Recommend Seller!

30.07.2025

B**M

works like a charm

It was easy to install. worked as advertised

6.11.2024

J**H

Good for heated mirrors

I used this to control heated mirrors i added to my truck. Works good so far

23.04.2025

Frost Fighter ThermaSync Defroster/Heated Mirror Control

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