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I am pretty sure the 30 amp circuit breaker is for power windows or conv top applications. The circuit breaker is used in this application so that when your holding the up or down button and the window or top reaches its full travel and stops the motor. The wiring does not stay under full load...
I would start with measuring the voltage with a digital voltmeter. Measure battery voltage. Should be high 12's. Disconnect all of the headlight sockets, remove all the other light bulbs in the circut and measure the voltage. You should see only a small drop in voltage. If the voltage is good...
Its hard to believe that they can go bad....had to find too....Voltage most likely measured fine. It is when you need the amps the problem will rear its ugly head...
If the battery has tested good as well as the starter it has to be a connection, ground or wire failure. Most likely a bad engine ground as it sounds to not be getting the amps its needs. Clean the all connections of paint and rust and try again. I have seen repoped positive battery cables lose...
Hopefully that is it and it wasn't a casualty caused by something else. I would recommend checking/cleaning your ground connections if you havn't already. Let hope your all done...
Check the ground wire connections. I feel a wire connection was stressed on the hard acceleration....but an odor inside...hmmm. Check wires on Ammeter gauge too...
I would check the circuit board in the area where the voltage limiter inserts. Check if for damaged solder joints or damage on the board. If you find nothing there it sounds to me that the ground to the dash cluster is lacking. Also check the ground to the whole dash assembly...
The original voltage limiter that is on the cluster gauge circuit board is mechanical and could have stuck for a moment in the closed position. I would replace that with a newer electronic one. I put IV4 Solid State Instrument voltage limiter push in type. no problems since..
I have seen this before. I would have to guess the engine ground wire is either bad or there is a poor connection, paint, rust preventing a solid ground. The other devices don't need the amps....