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 A
Mounting Type
Socket Mount

⚡40A high current capacity

🔋12V standard automotive voltage

⏱️15ms ultra-fast switching

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Description

⚡ Power up your ride with precision and protection!

ROBUST DURABILITY - Rated for 100,000 electrical and 10 million mechanical operations—built to outlast your toughest journeys.
BUILT IN DIODE PROTECTION - Safeguards your vehicle’s electronics from voltage spikes for worry-free rides.
UNIVERSAL 12 V COMPATIBILITY - Seamlessly integrates with cars, trucks, boats, and motorcycles for versatile, plug-and-play convenience.
PREMIUM SILVER ALLOY CONTACTS - Ensures ultra-low resistance (≤100mΩ) and long-lasting reliability under heavy loads.
COMPACT ENERGY EFFICIENT DESIGN - Small footprint with low power consumption, perfect for tight engine bays and extended battery life.

The Gebildet 12V 40A 4 Pin SPST Car Relay Harness features a built-in diode to prevent voltage spikes, premium silver alloy contacts for minimal resistance, and a compact, energy-efficient design. Rated for 100,000 electrical cycles and compatible with all 12V automotive systems, it delivers fast 15ms switching and reliable performance across cars, trucks, boats, and motorcycles.

Specifications

ASIN	B078T8CMF6
Best Sellers Rank	#1,552 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 A
Contact Material	Silver Alloy
Contact Type	Normally Open
Current Rating	40 A
Customer Reviews	4.7 4.7 out of 5 stars (2,429)
Manufacturer	Gebildet
Maximum Switching Current	40 A
Minimum Switching Voltage	8 volts
Model	E079
Mounting Type	Socket Mount
Number of Items	2
Number of Packs	2
Operating Time	0.02 seconds
Operation Mode	Manual
Part Number	E079
UPC	694090222994
Unit Count	2 Count
Upper Temperature Rating	70 °C
Wattage	480 watts

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S$18

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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