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

⏱️15ms ultra-fast switching

🛡️Built-in diode for surge protection

€ 22.08

Duties & taxes included

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Drive with confidence—power, speed, and protection in one sleek relay!

BUILT IN DIODE PROTECTION - Safeguards your vehicle’s electronics from voltage spikes.
COMPACT EFFICIENT DESIGN - Low power consumption with high sensitivity fits any tight automotive setup.
LIGHTNING FAST 15 MS RESPONSE - Instant relay activation for seamless electrical control.
DURABILITY THAT LASTS MILLIONS - 100,000 electrical and 10 million mechanical operations ensure reliability.
POWER THROUGH WITH 40 A CAPACITY - Handles heavy-duty automotive loads effortlessly.

The Gebildet 12V 40A 4 Pin SPST Car Relay Harness features a robust silver alloy contact rated for 40 amps, ultra-fast 15ms switching time, and a built-in diode to prevent voltage spikes. Designed for automotive, truck, van, boat, and motorcycle applications, it offers exceptional durability with up to 100,000 electrical and 10 million mechanical operations, operating reliably across -55°C to +70°C. Compact and energy-efficient, this relay harness ensures seamless integration and long-lasting performance in any 12V DC system.

Specifications

ASIN	B078T8CMF6
Best Sellers Rank	#2,009 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Starter Relays
Brand	Gebildet
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 out of 5 stars 2,379 Reviews
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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