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Mercruiser Electrical issue

"Just rebuilt Sea Ray 230 CC b

"Just rebuilt Sea Ray 230 CC boat ran great for about 2 hours. After 2nd hour, it appeared to overheat, oil pressure dropped to about 18psi, started to charge at 16 volts. After I shut down the engine, it re-fired easily all gauges returned to normal for about 30 sec then displayed same symptoms. I have checked with independent gauges, oil pressure is not low, engine is running at 175 F, not sure about the voltage yet. I've posted this on a couple of sites and received a variety of mixed answers. Anybody any thoughts?"
 
"Bill:

Scrape the paint off


"Bill:

Scrape the paint off to bare, shiney metal where they connect. Cover w/a dab of lithium grease after the connection is made. Or spray w/battery anti-corrosion solution; note: not the clear varnish type."
 
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