L3710 Dead instrument panel.

[Woodsman603]

2000 L3710

Past two uses, the battery went flat enough that it wouldn't crank. Booster pack and it fires up. Was ok for those two uses.

Third use, fires up, idles fine, everything works. Start plowing snow, get to the end of the driveway and I lose up and down motion.

Note: This has EA's Third Function. When in use, up/down because plow angle. So that switch instead of acting like a momentary, was stuck on.

Returning back to the house with no up/down, I notice my instrument panel is dead. No gauges. Nothing. Park the machine and start digging around.

At this point, I can't shut the tractor off. I d/c the battery with the key out and still runs. I block the intake to kill it.

Wait some time to scratch my beard, and turn the key. Dash is dead. I can't even hear the glow plug ignitor kick on. Nothing there. Check fuses, all good except "PANEL RELAY".

I've swapped in three of the five relays with no luck. The Timer, Glow Plug relay, and "controller kit" relay.

Which relay is the PANEL RELAY?

Key is functional because the starter kicks off fine, lights turn on, and directionals work in the RUN position. I think I'm trying to nail down which replay the PANEL RELAY is.

Some have suggested a battery, I have a deep cell battery for my boat on jumper cables hooked to the battery as well, and still nothing.

What else am I missing? Thanks.

 

[Woodsman603]

SORTED

The prongs for the PANEL RELAY fuse were corroded. That killed all the relays after it. Wriggled the fuse around a bit, everything came back.

 

[RjCorazza]

Nothin' like a little wiggling to diagnose a problem.
Glad you got it straighted out!

 

[JJT]

Pull the relay fuse and apply some di-electrical grease to the prongs. A little goes along way.

 

[TMGT]

Nothin' like a little wiggling to diagnose a problem.
Glad you got it straighted out!

There is actually an official "jiggle test" for electrical systems in automotive diagnostics!

Sent from my SM-S921U using TractorByNet mobile app

 

[JohnSm33]

2000 L3710

Past two uses, the battery went flat enough that it wouldn't crank. Booster pack and it fires up. Was ok for those two uses.

Third use, fires up, idles fine, everything works. Start plowing snow, get to the end of the driveway and I lose up and down motion.

Note: This has EA's Third Function. When in use, up/down because plow angle. So that switch instead of acting like a momentary, was stuck on.

Returning back to the house with no up/down, I notice my instrument panel is dead. No gauges. Nothing. Park the machine and start digging around.

At this point, I can't shut the tractor off. I d/c the battery with the key out and still runs. I block the intake to kill it.

Wait some time to scratch my beard, and turn the key. Dash is dead. I can't even hear the glow plug ignitor kick on. Nothing there. Check fuses, all good except "PANEL RELAY".

I've swapped in three of the five relays with no luck. The Timer, Glow Plug relay, and "controller kit" relay.

Which relay is the PANEL RELAY?

Key is functional because the starter kicks off fine, lights turn on, and directionals work in the RUN position. I think I'm trying to nail down which replay the PANEL RELAY is.

Some have suggested a battery, I have a deep cell battery for my boat on jumper cables hooked to the battery as well, and still nothing.
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What else am I missing? Thanks.

That sounds more like an electrical/control issue than just a bad battery. The fact it kept running with the key off and the panel went dead points to something stuck or shorted.
I’d be looking closely at that third function switch/valve you mentioned — if it stuck on, it could’ve caused a short or backfeed into the system. Also check grounds and the main harness around the dash and loader controls.
As for the panel relay, on a lot of tractors it’s tied into the ignition circuit or fuse block — sometimes labeled differently in the manual. Might be worth tracing power from the key to the panel to see where it drops.