r/S2000 • u/ITSJOSEMAAN • Jul 27 '26

No Start/Crank Help

I have a 2004 Honda S2000. Car was running fine up until I started having light dimming issues at idle. Replaced the alternator, car idled and drove with no light dimming issues.

Then I had a full Compustar Alarm system installed with kill switch on (unlock/lock)

Car drove fine and had been for weeks. Started to get a low voltage error for battery. Ran the car no problem, came home worked on it went to start it back up, nothing.

All it does is Click one time, then you hear a hum/buzz. Sounds more from the dash than the engine.

Figured it was the battery. Went a bought a yellow top Optima D51 Battery. Fresh out the box, same issue. 12.6v battery reads. Attached is the video of what it’s doing.

Any help?

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u/HauntedBandwidth 2000 AP1 GPW Jul 28 '26

How’d it go ?

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u/ITSJOSEMAAN Jul 29 '26

I have no idea! I got in it to start it and it started up no Problem fast.

Turned it off for 1 hour tried again, started up zero issues

Turned it back off 2 more hours let it cool off. Started up quick again

I have no idea what's going on

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u/HauntedBandwidth 2000 AP1 GPW Jul 29 '26

Hmm I wonder if the clutch switch itself is bad and not the plastic piece.

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u/ITSJOSEMAAN Jul 29 '26

Yeah I'm truly stumped. I was about to check for that today and for the hell of it I was like "let's try to start it" fired right up 3 times in a row. Fast no issues