I recently replaced the chassis battery and now have no power to the radio or the cigar lighter. All fuses check ok.

Any suggestions on where to start?

 

Its a fuse. Should be a 10amp. Get a volt meter and check all under dash and hood.

 

That's the first thing I checked. The fuse for this S2000 is a 15a for the radio.

Regards,

Hal

 

Some vehicles have 2 fuses that control the radio. I have come across many vehicles that have one under dash and one under hood. Its also possible whatever caused it to pop melted a wired and its being ground out somewhere

 

Accessory power relay needs replacement. It's under the dash on the driver side. There's 2 relays next to each other, you need to replace 1 of them.

 

http://www.s2ki.com/s2000/topic/7632...y-power-relay/