L3400 will not start, question

[From scratch farms]

When I try to start the tractor, I just get an electrical buzz, this has been an intermittent problem, when it happens, in the past I have opened the hood, and tapped on the wires and box mounted just above the battery, the box appears to me to house a series of relays, anyway, after tapping on the box, at least until now, this seemed to cure the problem and the tractor would start. My guess is that I need to replace one of the relays, help, thanks

 

[Jim L.]

Calcasieu, "eagle cry".

Sounds like a relay or a bad connection.

Be nice to have a wiring diagram. And a Volt-Ohm Meter. Maybe a helper too.

Diagnose by metering one connection at a time. Move the wires around to find the loose connection.

Check relay sockets for proper connections.

Test the relays by themselves, or replace (expensive way).

plan on taking awhile since the problem will come and go.

Sorry it ain't easy.

 

[North Idaho Wolfman]

Doesn't look like you have a starter relay but you do have an OPC timer and that is most likely your problem spot.