Compression Ignition Addict
Join Date: Dec 2007
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Couple a things, First the tach has nothing to do with the starter. The difference is weather the CPS signal is sent to the tach or not. In an '01 (like yours) some do / some don't... Sometime in '01 the new, updated, instrument cluster was introduced that included a Trans Temp Gauge.
If yours doesn't have that gauge you're supposed to show cranking rpm on the tach. If it HAS that gauge you're not.
Both batteries are in parallel and I don't know how you could be seeing different voltages while cranking. Maybe it'd be a good idea to reevaluate all the connections and cables......
Take the cover off the fusepanel and put your hand on the relays there, one at a time, and see if you can't find one of them giving you that buzz, look especially at the IDM relay (303 maybe?).
Does it only buzz while cranking?