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Losing fuel pressure when in wot


V8 Beast

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IMHO this tells you nothing.

If the load on the system exceeds the output of the alternator the voltage can read low while the charging system is working as designed.

You need to measure the load using a clamp on amp meter after the alternator and after the battery.

Have you tried a different battery?

 

there are definitely better ways but I've used that to diagnose charging issues (usually just to determine a bad battery or alternator) for 20 years and it's worked for me. A load test would be preferred but this has always worked for me.

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