Trouble starting TG1860

[Russell King]

They are both the same thing basically. One is single relay and holder and the other is five of a similar relay and holder.

Both will do what is described in this thread.

 

[geomiklas]

They are both the same thing basically. One is single relay and holder and the other is five of a similar relay and holder.

Both will do what is described in this thread.

Can you explain to me why adding this relay makes the existing starter work?

 

[geomiklas]

I bought a whole box of these Amazon.com: 5 Pack - EPAuto 30/40 AMP Relay Harness Spdt 12V, 5-PIN SPDT Bosch Style : Automotive
They come with wire harness, plug, and bracket. I used one for my starter relay installation, another for my tow behind sprayer harness I added, and another for my lighting system I added/upgraded.


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Would you show me a schematic of how you wired the generic relay to your Kubota?

 

[geomiklas]

John Deere sells the relay in a kit. Here's one of them. https://www.amazon.com/John-Deere-S...hvlocphy=&hvtargid=pla-4583520395653093&psc=1

Would you show me a schematic of how you wired this into your Kubota's starter?

 

[Russell King]

Can you explain to me why adding this relay makes the existing starter work?

See this diagram for a typical wiring method.

As you can see the relay is activated (85) from the existing wire that is currently connected to the spade terminal on the solenoid. The wire going to the solenoid spade terminal is now replaced by the wire from terminal 30.

The present wiring through the key switch has the current and voltage going through a few switches. Each switch will drop some voltage and limit some current. Eventually the voltage and current is too low to reliably activate the starter solenoid to spin the starter motor.

When you install the relay as shown above it acts as a switch between the battery (87) and the starter solenoid spade wire (30). There is very little chance of much voltage or current drop in that circuit if you use larger gauge wires. So when you activate the key switch that provides power to terminal 85 and that closes the switch between 87 and 30. This relay requires very little input power to activate so it will reliably provide the required power to the starter solenoid.

Hope that explains it well enough.

 

[geomiklas]

See this diagram for a typical wiring method.
View attachment 172608
As you can see the relay is activated (85) from the existing wire that is currently connected to the spade terminal on the solenoid. The wire going to the solenoid spade terminal is now replaced by the wire from terminal 30.

The present wiring through the key switch has the current and voltage going through a few switches. Each switch will drop some voltage and limit some current. Eventually the voltage and current is too low to reliably activate the starter solenoid to spin the starter motor.

When you install the relay as shown above it acts as a switch between the battery (87) and the starter solenoid spade wire (30). There is very little chance of much voltage or current drop in that circuit if you use larger gauge wires. So when you activate the key switch that provides power to terminal 85 and that closes the switch between 87 and 30. This relay requires very little input power to activate so it will reliably provide the required power to the starter solenoid.

Hope that explains it well enough.

Thank you for this explanation.

I am going to add the relay.

George

 

[lmichael]

Honestly doing the relay is FAR simpler and better than struggling with Kubota's terrible circuitry and multiple voltage drops across switches and wiring FAR too small and light for the task at hand.