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

Product ID: 61018792

Details

Connector Type
Spade
Contact Material
Silver Alloy
Contact Type
Normally Open
Current Rating
40 Amps
Mounting Type
Socket Mount

⚡40A high current capacity

🔋12V optimized coil voltage

⏱️15ms fast operate time

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COP 77473

Duties & taxes included

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Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power up your ride with precision and protection!

RAPID RESPONSE TIME - Operate in just 15 milliseconds to keep your electrical systems responsive and safe.
BUILT IN DIODE PROTECTION - Safeguards your vehicle’s electronics from voltage spikes for ultimate reliability.
COMPACT EFFICIENT DESIGN - Small footprint with low power consumption, perfect for tight automotive spaces.
UNIVERSAL 12 V COMPATIBILITY - Seamlessly fits cars, trucks, boats, and motorcycles with standard 12V DC systems.
PREMIUM SILVER ALLOY CONTACTS - Ensures ultra-low resistance (≤100mΩ) and long-lasting performance over 100,000 electrical cycles.

The Gebildet 12V 40A 4 Pin SPST Car Relay Harness combines high durability with advanced built-in diode protection, delivering fast 15ms switching and ultra-low contact resistance. Designed for universal automotive use, its compact 12AWG socket harness supports up to 40 amps, ensuring reliable performance across cars, trucks, boats, and motorcycles. Rated for over 100,000 electrical operations and built with premium silver alloy contacts, this relay harness is engineered to safeguard and optimize your vehicle’s electrical system.

Specifications

ASIN	B078T8CMF6
Best Sellers Rank	#2,156 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Starter Relays
Brand Name	Gebildet
Coil Voltage	12 Volts
Connector Type	Spade
Contact Current Rating	40 Amps
Contact Material	Silver Alloy
Contact Type	Normally Open
Current Rating	40 Amps
Customer Reviews	4.7 4.7 out of 5 stars (2,350)
Manufacturer	Gebildet
Maximum Switching Current	40 Amps
Minimum Switching Voltage	8 Volts
Model	E079
Mounting Type	Socket Mount
Operating Time	0.02 Seconds
Operation Mode	Manual
Part Number	E079
UPC	694090222994
Unit Count	2.0 Count
Upper Temperature Rating	70 Degrees Celsius
Wattage	480 watts

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