[Maniac Marshall]

Hey guys, quick question,

I may be able to pick up a vintage power supply for cheap, output voltage says 13.5v DC, 3A max continuous, 5A peak.

Will that run a wiper motor?

 

[bfjou812]

It really depends on what you're using the wiper motor for. I would probably say no due to the fact the motor can draw close to that with no load.
These are the ones I use , although slightly more expensive , they provide trouble free service and will handle the amperage requirements of a wiper motor. The ones I use are in the 25 amp range . The one I linked is 8.5 amps Also you can fine tune the power supply if you need to.

http://www.mpja.com/12-Volt-Power-Supply-85A-100W-Switching/productinfo/33467+PS/