Rockford Fosgate T1500-1BDCP

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R2035 is either a 1 ohm or a 13 ohm. I think the 13 ohm is the latest revision.
 

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If you have a good signal, I think they're mismatched. The threshold isn't always close enough, even with matching date codes.

Unless you have an isolated scope (battery powered) or can use your scope in differential mode, I'd suggest desoldering the center legs of the rectifiers and checking the drive signal. With the rectifiers out, you can ground your mains powered scope to the source leg of the FETs to get a good view of the signal.
 
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