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Repowered witj twin df200ap in 2018. Starboard check engine light goes on when in idle for about 20 minutes. Single beep. No performance problems. Replaced batteries, white wire splice to battery and fuse holder, cleaned and greased up all connections. Since it’s only starboard engine should I just concentrate on that harness and engine connections? Is there a way to test if I run a parallel wire direct from engine to battery?
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