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Which wire on the LMs is considered the ground for the LM? I see from this link, http://minimopar.knizefamily.net/ecu/lm-1987-t2.html, that red 24 and 25 are Signal ground source from fuel rail bolt and Signal ground to sensors respectively. Also, there are two grounds on the blue connector on 7 and 8, Power ground source from fuel rail bolt.
I'm trying to get a better ground for my wideband to rule out any issues there, so which ground for the LM is best?
I just hooked up an Apexi AVC-R, which is a piggyback e-boost controller you tap into the wiring harness. For the grounds on it(there are two), I tapped into the Blue connector, pin #7 or pin #8 wires, both have a Light Blue w/red tracer.
Cool, that's what I needed to know!
The sensor signal ground is what I often use. However, for WB or other sensitive stuff I started to run it straight to the battery.
I'll test it with the LM ground and see if it corrects the issue. If not, I'll definitely run it to the battery.