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Old 04-09-2016, 21:47   #1
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Join Date: Dec 2006
Posts: 85
Isolated engine

I'm now running my engine above earth. I have a steel boat and electrolysis had caused a lot of damage, so I decided to make everything above earth. I wasn't able to isolate the engine from the hull because I couldn't install a drive-saver on the propeller shaft, so I had to make sure the engine wasn't being use for dc(-) return. The house wiring was all good.
I took the following steps:
1. Replace single wire engine sensors with two wire sensors.
2. Install a solenoid on the starter motor.
3. install an isolated wire on my alternator instead of the case being ground.
4. Check all engine wiring to make sure the engine isn't being used as a ground.

I already had some two-wire sensors, but I replaced the temperature and oil sensor, and the oil pressure switch. (cost $200).
I installed a solenoid on the starter ground to the battery through the ignition switch. (cost $100)
I had an auto electrician install an isolated ground on my alternator (cost $150).
Ran wires that were using the engine for a ground directly to the battery(-) .
So for my installation the total cost was $450 but of course there was a lot of first-time mucking around to get it right.
Cheers, Jim
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