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Hello my name is ***** ***** am I speaking with? It's possible, but not likely, and there are other more likely things that would cause it. Is there any kind of battery switch between the outboard and battery, or do the battery cables connect directly to the battery? How many batteries are on the boat? Does the battery ever get charged while connected to the outboard? What kind of nuts are on the battery terminals? (wingnuts or something else?)
Hi Normand. Okay good. Do you have a volt meter so we can test the battery cables themselves and make sure that they are not a problem.
Okay we are going to do 2 different sets of measurements. Take your meter negative lead and stick it to the battery positive terminal. Take the meter positive lead and stick it to the other end of the positive battery cables where it connects at the engine. Turn the key to start to crank the engine over, and record the reading. Do the same thing for the negative battery cable and let me know what you get for both sets of readings.
I never heard back from you. How did you make out?