Have you tried checking the battery voltage when you push the slideout button? That may explain the intermittent nature of the problem. I always either have my main engine running or shore power connected when I'm extending or retracting my slide. It's a big load. A secondary reason for doing this is that if your voltage is low, the circuit will try to increase amps to compensate. This has the potential to damage your slide motor.
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2000 Tourmaster
Cummins M11 450 HP
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