Car runs raggedy, car shuts off and loss of electrical power

What do you mean , tries to start ? When you turn the key to start what happens ? Starter clicks , starter spins the engine around . Doesn't start an run . ,what ? Now it just so happens that your vehicle does not have a relay switch . Does the car have automatic trans . or manual ? Power from the ignition switch goes through the park neutral position switch to the starter solenoid S terminal for auto trans , An through the clutch pedal position switch for a manual trans .

Your best bet , have a qualified repair shop check it out .

lots and lots of reasons, guessing. over 50 (bad engine?)
but does it crank?, no car starts unless it's cranked or
like my car, push started or gravity started (a 6sp m/t)
if engine fails to start , and cranks robustly (fast starter motor)
then
1: never tuned up, running 10 year old spark parts.
2: blow fuse. check fuses.
3:; lost spark, check spark.
4: flooding or loss of fueling. to unflood any engine, crank at wideopen throttle (oper, guide tells you that)
5: timing belt not changed at 60,000 miles it will fail, and will not start
or start have like 1/4 power.
6: lost compression in or more cylinders.?

or
get it serviced? if all that is too much work? or confusing.

the alternator isn't charging battery that would account for loss of power and also clicking when try to start , try a jump start if it starts then you know its the battery so with engine running check the alternator charge rate with a voltmeter across the battery terminals anything below 13 volts then check the alternator belt is tight enough , good condition etc , then recheck charge rate if still low fit new alternator

it could be the the starter solenoid or starter itself that is the problem.you said it started when you started using your fm transmitter have you tried not using it to see if it starts working correctly for a few days.if it works normally then this is the problem.try another outlet if you have one to see if the problem starts again.

I have had the same problem on my '92 Mustang. The issue for me was when I turned the key to the on position all my lights and pumps would start up just fine and I could listen to the radio. But when I tried to start the car there would be nothing but a loud "Click" from the starter solenoid. I discovered that it was a bad connection at the starter itself and a few worn out spots along the starter electrical cable running from the solenoid. I suggest checking that the connections at the starter are clean and in if give the electrical cable a few tugs in certain areas, that is how I found out it was an issue with the cable, oh it started just fine if I jiggled the cable a bit lol.

Hope that helps.

Do you hear a fairly loud 'click' when you try to start? That should be the solenoid for the starter that is trying to work. You need a test light or voltmeter to check what is happening to the starter itself. When the solenoid clicks, it is pulling a very heavy electrical contact closed which applies 12 volt power to the starter motor. Check the large terminal on the solenoid that has the + battery cable attached--the test light should light before and during any attempt to start (the meter should indicate 12 volts). If the light goes out during the start attempt, clean the battery terminals and check the condition of both cables. If still no start, test the starter side terminal of the solenoid--the light should come on only when start is attempted. If it does, the starter is bad. If you get no light at all, the solenoid is bad. If the battery negative cable is connected to the car body, check for a broken or loose cable that runs from the car body over to the engine. Hope this helps!

did u check your fuses you may need to check voltage in your starter conections good luck

the clicking sound is the starter solenoid on the starter, replace it, the contacts are burnt that engage and supply the starter motor with power to spin the engine over, this is a very common problem on Japanese starters.

Possible faulty starter motor. If it is stuck on, you will not always know, it will drain your battery and burn itself out, particularly the solenoid. It could blow other fuses, check and replace if required. Try replacing starter motor. Some times you can give the starter motor a sharp tap and it will work but not always, first sign of a dodgy starter motor is click click click.

Clean & inspect battery connections, (both ends), charge battery fully & have it load tested. I suspect bad connection, bad battery, and at worst, worn out starter.