L4400 glow relay issues

[ORtreefarmer]

We’ve been having some problems with our Kubota recently. Around a month ago, it was starting fine & running well. Parked it for 15 minutes to unload the trailer, went to start it back up and had no crank, no start. When the key turned to the on position, the battery light seemed dim, and was making a buzzing/ clicking sound from the dash. When the key turned to start, no sounds or clicks or lights on the dash. Checked the batt with a multimeter, plenty of juice. Took apart the dash, turned the key to the on position the relay on the right was buzzing/ vibrating. The relay wouldn’t stay open/ or closed but went back and forth (not sure which completes the circuit). Went to a dealer and got a new glow plug relay. Installed, turned key to the left to heat glow plug, the glow light came on. Turned it to the on position, heard the usual crisp snap of the circuit connecting, started right up, goood to go.
Or so I had thought.
It is exactly 35 days later and the exact same problem happened again. Turned the tractor to on position heard the same relay bouncing back & forth and not making the connection. Took the dash apart again, turned the key sure enough you can feel it vibrating back & forth. I thought it was possible the 1 month old relay had gone bad, but I didn’t think it was likely. Well I went and picked up a new one this morning and installed it. The brand new one is doing the same thing. Went thru all my fuses, they all were good.

Was just hoping someone might be able to point me in the right direction on what to do or look for next.

This is my first post on the site And I appreciate any advice the grey beard kobota gurus may have.
Nick

 

[North Idaho Wolfman]

Use a test light and check both the positive input and the ground.
Could have a bad switch or a bad ground connection.

 

[Roadworthy]

I always like to start with the battery and go from there. Clean battery terminals and connectors then tighten securely. Follow cable to ground. Clean and tighten there. If checking battery with multimeter monitor voltage while someone else tries cranking the tractor.

 

[ORtreefarmer]

I always like to start with the battery and go from there. Clean battery terminals and connectors then tighten securely. Follow cable to ground. Clean and tighten there. If checking battery with multimeter monitor voltage while someone else tries cranking the tractor.

Thanks for the suggestions. Cleaned the terminals & the ground yesterday and retightened. Will check the Battery w/ multimeter while trying to crank when I can get another set of hands down here right now it’s just me. Test light is bright when testing the starter power wire. When key is in “on” position & test light is on the starter power wire, the light is very dim. Going to keep plugging along and see what more I find out.

 

[jerradmeissner]

Did you ever find out what was causing your issue? My tractor started doing it a couple months ago, with similar symptoms. The relay was swapped out and still doing the clicking/vibrating. Any help would be appreciated.