My 2002 S2000 will not start. I have a new battery and I jumpered the clutch switch and still no start. Everything electric I try works - fan, radio, lights. I do get an electric hum when I press and hold the start button. That sound stops when I release the start button. I have not tried banging the starter but the car started fine a couple months ago and it has been sitting. Any thoughts before I start tearing the electrical apart would be great.

Thank you

 

Try putting a socket on crank pulley abd turn motor a bit. Then see if it starts (don't forget remove wrench!)

You're hearing a hum, which to me says most of the electrical is working. The ignition switch, start button, etc. What isn't working is starter not actually turning.

Likely that is because its not getting enough power. Like a bad main battery ground, or bad main + cable, battery to starter. Or just a low battery.

But my suggestion above was to rule out a situation where starter tries to enfage flywheel, but a bad tooth or something is hanging it up. Rotate crank means different tooth.

Next rule out battery itself. Simple voltage check. If its below about 12.4V, that is likely your problem. Try charging battery first, retry.

 

I will try to turn the motor with a socket, but I fear its something in the harness between the battery and the starter. The battery is brand new and at 12.5 V

 

Sounds like starter.

 

Just whack the starter and report back...

 

I will crawl under it this week and wack the starter. I still want to make sure the wiring to the starter isn't as corroded as the battery to body connection was.