Question 1

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?

Accepted Answer

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.

Question 2

Do i need to buy a relay for switch

Accepted Answer

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

Question 3

Does this come with wiring instructions?

Accepted Answer

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.

Question 4

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

Accepted Answer

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.

ASIN	B075FY4194
Actuator Type	Push Button
Best Sellers Rank	#500,940 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Rear Window Defogger Switches
Brand Name	Frost Fighter
Circuit Type	1-way
Color	Black
Compatible Devices	Heated Mirrors, Rear Window Defrosters
Compatible with Vehicle Type	Passenger Car
Connectivity Protocol	Wi-Fi
Connector Type	Blade-type Connector
Contact Material	Copper
Contact Type	Normally Open
Control Method	Remote
Control Type	remote
Controller Type	Wi-Fi Enabled Push Button
Current Rating	25 A
Customer Reviews	4.6 4.6 out of 5 stars (198)
International Protection Rating	IP0X
Item Dimensions	8 x 4 x 1.5 inches
Manufacturer	Planned Products LLC
Material Type	durable housing material
Model	2712
Mounting Type	Plug In Mount
Number of Items	1
Number of Positions	2
Operating Voltage	12 volts
Operation Mode	Automatic,Automatically,Off
Part Number	2712
Switch Type	Push Button
Terminal	Button
Unit Count	1 Count
Wattage	300 watts

Frost Fighter ThermaSync Defroster/Heated Mirror Control

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