I have a marine ECM that supplies 0-5VDC to two injectors. Signal from the ECM to one of the injectors is intermittent and cuts the engine out and backfires.
My question is: Is there something that I can make to take the 0-5VDC from the good output of the ECM and deliver a double 0-5VDC output without increasing the load on the ECM?
Any help would be appreciated.

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There's not enough info to really help. Try to narrow down why the power is in and out. Is there a loose wire somewhere, corroded pin in a plug, etc..? Figure out why the problem is occurring first, then you can work on a solution to the problem. Otherwise it's just stabbing in the dark and hoping for the best.