Generator Control Unit (GCU)Troubleshooting
When you have a suspected bad GCU, try that unit in the known good side first and see if it works. Do not install the good one in the inop side. Remember, IT IS NOT A FUSE !! A faulty GCU can't hurt anything, but a faulty system can damage a good GCU. Before you even remove the units, look closely at the generator A&D leads for damage and chafed areas. If you use a GCU as a fuse, your vendor will charge you for an overhaul…again.
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