The wire from my alternator to the isolator sometimes gets hot. Whats happening?
The wire is undersized for the maximum possible current flow. The OEM Alternator is capable of a sustained 85 amp output. When the coach is drawing a heavy load the wire will get hot. The problem is compounded if you have a higher amperage after market alternator. The solution is to replace the OEM wire with a heavier gauge wire. I recommend using a marine engine environment chart for selecting wire sizes in the engine compartment of the GMC. These charts provide a greater safety margin than standard automotive charts. Also, be cautious of the additional heat generated in the GMC engine compartment.
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