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Battery dead approx 8 yrs old Cranking battery. Charged all…

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Battery dead approx 8...

Battery dead approx 8 yrs old Cranking battery. Charged all nite still no power

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.

Got report yesterday that there was a screaming noise so I charged the battery all night and still no power and all the power options are off, so I have purchased a new battery and I'm about to install it - Noticed when I pulled the battery out there is a small black wire hanging freely and appears to be coming from the motor

Mechanic's Assistant: Is there anything else the Marine Mechanic should be aware of?

Questioning what the small black wire goes to and no problems starting the engine until last night

Submitted: 11 months ago.Category: Boat
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Answered in 2 hours by:
9/17/2017
Marine Mechanic: Tan, MerCruiser Certified Technician replied 11 months ago
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,417
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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Hello, I'm Tan. Welcome to JustAnswer. I'm reviewing your question and will reply momentarily.

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Marine Mechanic: Tan, MerCruiser Certified Technician replied 11 months ago

Black is connected to the negative terminal of the battery if this is a factory wire.

The black wire is a ground wire for either the bilge pump or another accessory.

Can you post a pic of the wire?

Does engine turn on the gauges when key is turned on?

Could I get make, model and serial number of your engine please?

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