Is the pump getting hotter than you recall or any other symptom of increased load?
Have you changed your wiring lately so some other circuit might be loading that line, or have a loose ground etc.?
Is your system voltage normal or could your battery voltage be down a bit causing the pump to pull more current to meet its needs?
Might want to try cleaning your battery posts and doing a general health check on the wiring to check for high resistance shorts and or bad connections.
Larry
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