What could cause forward and reverse drive failure on a JLG E300AJ if the shunt wiring checks out but a 7740 code still shows?

Nicholas Villa

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I'm still learning my way around electrical troubleshooting and could really use some help on my JLG E300AJ.

Everything else works fine, but I've completely lost forward and reverse drive. I'm getting a 7740 code that points to the shunt circuit. I already checked the wiring and continuity, and everything seems okay, which is what's confusing me.

What I don't really understand is how the shunt actually works, since all 3 wires are connected to the same bar. I'm not sure what exactly I should be testing or looking for.
 
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