Hello
I just bought a set of Fender Vintage Noiseless pickup & I also installed the Pots they came with 500k for volume & (2) 1Meg for tone. I want to go back with the original 250k but I dont know if this will effect the pickups in a hum or hiss. The pickups look as if they are a stacked single coile instead of a side by side humbucker. Thank you

It wont affect noise levels, as long as the soldering is ok.

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No no and no

In theory you just loose some highs and some output.

But will you hear it ?
Yes they are humbucker with Fender tone

Welcome.

250Ks are your best bet with this pickup set as they add a little more 'body' to the overall tonality while curtailing the anemic extremes. Hum and hiss are not factors here.

Yes, the VNs are in fact, stacked single coil HBs.

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You dig?

Thank you for the info. The other ? is can I have a 250k pot as a volume & for the neck tone w/ a 1meg bridge tone? Sence 250k will go into 1meg evenly. To brighting up the bridge pick up.

Yes. The perfect division of 1,000K/250K is irrelevant in your context though. Be advised too that the dynamics of the 1,000K pot will be less dramatic than that of the 250K ones due to the weaker output of the VNs vs. most other stacked HBs.

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You dig?