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Guyfang, I started a new posts with more information from my work on her today. Link below, thank you. https://www.steelsoldiers.com/threads/mep-007b-dc-relay-control-issue.219092/

Ok, going through the TM electrical diagram A27-TB3 has the pump connections before they go to A5 (behind the main front panel). Does anyone know where they hid A27/TB3? I will start diagnosing A5 later today if I can verify continuity from A5 terminals to the pumps. Still looking for how...

More pictures of the diodes CR27/28 I replaced.

I replaced these diodes, located on a bracket to the left (front) side of the day tank. Per the TM, they are for radio interference; either way mine were broke/corroded. Still no power though. Is this the same bracket you are talking about?

I do have the TM's, I have read them -12 & -24 (I am still at a loss as to why there is a day tank at all on this genset). I spoke with Cat mechanic shop and they say, bypass the day tank and pump straight to the engine if possible since any excess will bypass internal check and return to the...

Red, (or others) Did you solve this issue? I have a 007B with 3306 cat doing the exact same thing. Even with Battle short on, the 2 lift pumps do not receive any power. Diodes C27 and C28 were bad, I changed them, still no power to the pumps. Re-set the mag pickup (ran it in until it touched the...