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Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3426
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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I have a 2000 searay 190. My cockpit electronics gave been

Customer Question

I have a 2000 searay 190. My cockpit electronics gave been acting up for the last year. Now only my horn works on control panel. The EMI shows fuses all good. Also my rpm and speed gauges work sometimes but not others.... where do I start to diagnose problem. I have a multimeter but not much experience using it. Thanks
Submitted: 9 months ago.
Category: Boat
Expert:  Charles replied 9 months ago.

Hello, my name is***** will assist you.

First, look at the connections on the back of the switch panel and make sure that there is no corrosion on any of the pins. then locate the brain box in the boat and inspect all of the connections for corrosion and ensure that all are tight. If nothing can be located, you wil need to replace the switch panel.

Customer: replied 9 months ago.
Not sure what brain box is?
Customer: replied 9 months ago.
switch panel is the main control in cockpit?
Expert:  Charles replied 9 months ago.

The push button on the dash is the switch panel. The brain box, could be located inside the engine bay or in the console.

Customer: replied 9 months ago.
Is the brain box the emI? It has all the fuses
Customer: replied 9 months ago.
Emi not eml
Expert:  Charles replied 9 months ago.

Yes that is it.

Customer: replied 9 months ago.
Does the emi affect the tach and speedometer as well?
Expert:  Charles replied 9 months ago.

No all of that comes directly from the engine.

Customer: replied 9 months ago.
If I remove switch panel is here a way to test it
Expert:  Charles replied 9 months ago.
Customer: replied 9 months ago.
no way to test it? Why might the tach and speed be intermittent?
Expert:  Charles replied 9 months ago.

Did you see the diagram?

The tach and speed may be on the way out. They are 16 yrs old now.

Customer: replied 9 months ago.
Good point! I will try a new switch panel.... is there is no way to test the old one.
Expert:  Charles replied 9 months ago.

Did you see the diagram I sent? The wire colors are in it. You could use an ohm meter to test it.

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