Originally Posted by carpediemracing

I'm still troubleshooting my SRM, sort of thinking out loud here.

Battery is soldered in properly, checked that a few times. 3.6v (new battery) at circuit board connection spots.

Can pick up cadence when swiping the spider with the pick up (crank off the bike). I've done that twice now, once earlier today. This is a spare harness that I have, not on the bike.

When placed lightly on BB spindle can pick up cadence with harness on bike. To see the computer head while I'm at the BB I have to unravel the wire a bit and let the computer head dangle next to the top tube.

Tightened crank, checked again, computer still dangling next to downtube. I could transmit enough force to display both cadence and power.

Put bike in trainer. Put computer on bar mount. Turn pedals. No cadence (and since no cadence, no power). Nada. Nothing.

I'm going to see if twisting the (brand new) harness does anything, etc. Also going to check with a different computer head.