Received a "Genuine" Toyota starter Relay from an Amazon seller. Yes, there's a risk of counterfeit parts when buying on Amazon. However, it appears legit. Amazon seller is JP-Carparts.
As much as I hate throwing parts at a problem, I need to have the car driveable and this is the least costly path for now.
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Packaging, as-received.
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Left - New Replacement; Right - Old Relay
I have several bags of Toyota parts that I purchased directly from a dealership parts counter; there are label variations in font type, location, etc. I believe the new relay is legit Toyota.
The car started this morning with the old relay. Replaced it with the new relay, ran errands (Target, Post Office, Bank) without incident.
I opened the old relay and the contacts look fine. There's barely distinguishable discolored spots where they make contact. No pitting, etc., nothing like a high mileage contact set.
There's more diag to be done. In the mean time, I'll just have to drive it around for verification.