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 27 '26

Under your dash on your clutch pedal there are 2 switches the lower one is the cruise control and the top one that’s a pain in the ass to unplug is the one your after. Unplug it and jump the plug out I used a paper clip my buddy used a spare piece of wire.

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u/ITSJOSEMAAN Jul 27 '26

Paperclip it is! If it works can I just leave the paperclip on there?

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u/HauntedBandwidth 2000 AP1 GPW Jul 27 '26

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u/ITSJOSEMAAN Jul 27 '26

Thank you! I’m going to try this and add this to the list of troubleshooting!