I received the jd2912 relays. what email address do i email?

You can contact son of wil through Amazon.

so in the picture the top red wire that is 87 goes to the motor to turn it on but it shows in the picture red turns to black and it is ground?

The red wire goes to the device that you want to turn on and the black to that Device

what gauge wire on battery terminals

I used a 14 gauge wire to the battery

I have a positively grounded (+ ground) system. The relay coil should still operate correct?

If you are stating the chassis is battery plus, then it should work, but would need to cycle your negative signals to control coils. John Deere 60 tractors have a positive chassis methodology, so might need to investigate how they operate to verify implementation.

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⚡ Drive with confidence—power, protection, and precision in one harness!

SILVER ALLOY CONTACTS - Premium contact material guarantees superior conductivity and long-lasting operation.
HEAVY DUTY 12 AWG HARNESS - Robust wiring ensures durability and reliable performance under pressure.
POWER THROUGH WITH 40 AMPS - Handles high current loads effortlessly for your automotive needs.
VERSATILE 4 PIN SPST DESIGN - Compatible with cars, trucks, motorcycles, vans, and boats for seamless integration.
VOLTAGE PROTECTION BUILT IN - Integrated diode safeguards your vehicle’s electrical system from harmful voltage spikes.

The 2pcs JD1912 Car Relay Harness features a 12V 40A 4-pin SPST design with heavy-duty 12AWG wiring and silver alloy contacts. Each harness includes a built-in diode to protect against voltage spikes, making it ideal for automotive, truck, van, motorcycle, and boat electrical systems. Engineered for durability and reliable high-current switching up to 40 amps, this relay harness ensures safe and efficient power management in demanding environments.

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Connector Type	Spade
Contact Material	Silver Alloy
Contact Type	Normally Open
Current Rating	40 Amps
Mounting Type	Socket Mount
Brand	Gebildet
Operation Mode	Manual
Wattage	4.8E+2
Coil Voltage	12 Volts
Contact Current Rating	40 Amps
Maximum Switching Current	40 Amps
Minimum Switching Voltage	8 Volts
Upper Temperature Rating	70 Degrees Celsius
UPC	694090222994
Manufacturer	Gebildet
Item Weight	4.6 ounces
Package Dimensions	9.02 x 2.64 x 1.3 inches
Item model number	E079
Is Discontinued By Manufacturer	No
Manufacturer Part Number	E079

2pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Motorcycle Boat

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