[Rich Dancaster]

Thanks to Tony’s Tips, Understanding your SmartCraft 1.0 “Medusa” Vessel Adapter Harness”. I continued to check for the source of the low voltage at the Medusa harness. This led me to a black box (lable not legible) but turned out to be a voltage regulator (24v to 12v). A quick check determined that it had 24v going in and only 5v coming out. Problem solved! Having access to the resources on this forum and the diagram of the medusa cable was priceless!

Cheers!
Rich

[Rich Dancaster]

Thank you for your reply Phil! Yes when taking the voltage reading I had a direct ground. I followed your advise this evening and after the shutdown which only took :15 minutes today I checked the voltage at the ignition switch and found 2.3 volts. from there I went to the 5 fuses on the wiring harness in the engine. The 3 fuses closest to the ECM were good reading 26v the 2 fuses farther out on the wiring bundle from the ECM (normally 13v) were reading the same as the ignition switch 2.3v. I have Glendinning electric controls and the input to the control box in the engine room on the lead labeled “Shift and Ignition interlock” had the same 2.3v reading on the only pin connection with voltage. I found the cannon plug that connects the engine wiring bundle to the rest of the boat and disconnected it. The fuses at the engine still had the same readings and as expected the ignition and Glendinning control box lead noted had zero.
Looks like the problem should be in the wiring bundle or the ECM or other black box on the engine. Interesting that 1 hour after the shutdown the voltage reading at the two low voltage fuses had increased to 4v and 30 minutes later to 5v. Hmmmm???
Does anyone know if the ECM or other box on the engine could cause this issue?

Thanks!

[Rich Dancaster]

Good information! Thank you Skipjack for the insight. Combining the manifold with the cooler service is a sound idea.

Cheers

[Author]

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