I have to keep asking for more details to narrow down the problem.
When the lights come on then off every 5 minutes, does the horn stay on for about 10 seconds or do the lights come on then sequentially turn off and the horn beeps once, that same way as when you first turn the key on and it goes through its self-test?
If your motor only turns 5000 rpm at full throttle, you are way overpropped and lugging the motor or there is a linkage or power problem not allowing the engine to put out its rated power. What size is the prop and what kind of speed do you get at WOT?
You have 2 separate situations that have to be resolved.
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
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The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.
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