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 rating

🔋12V coil voltage compatibility

⏱️15ms fast operate time

€ 21.83

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Description

⚡ Upgrade your ride’s electrical game with Gebildet’s pro-grade relay harness!

RAPID RESPONSE TIME - Switches in just 15 milliseconds to keep your systems running smoothly.
POWERHOUSE PERFORMANCE - Handles up to 40A current for robust automotive applications.
PRECISION DURABILITY - Silver alloy contacts with ≤100mΩ resistance ensure reliable, long-lasting operation.
SEAMLESS COMPATIBILITY - Designed for all 12V DC vehicles—cars, trucks, boats, and motorcycles.
BUILT IN VOLTAGE SHIELD - Integrated diode protects your electronics from harmful voltage spikes.

The Gebildet 2pcs 12V 40A 4 Pin SPST Car Relay Harness features a built-in diode for voltage spike protection, silver alloy contacts for low resistance, and a fast 15ms switching time. Compatible with all 12V DC vehicles, it supports up to 40A current and offers exceptional durability with 100,000 electrical and 10 million mechanical operations, making it a reliable upgrade for automotive, truck, boat, and motorcycle electrical systems.

Specifications

ASIN	B078T8CMF6
Best Sellers Rank	#1,779 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 (2,400)
Manufacturer	Gebildet
Maximum Switching Current	40 A
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 Count
Upper Temperature Rating	70 °C
Wattage	480 watts

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€ 21.83

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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