Where can I get a replacement battery for a Vector VEC127Y spotlite??

Look in a manual to see if it has a number https://searchmanuals.net/search7/?keyword=%2Bmanuals&gclid=Cj0KCQiAwc7jBRD8ARIsAKSUBHKEI80Q6CieEEng39GMJDInaMWCYCawMEogJFIuB4mhUxn45mkkNpoaAna6EALw_wcB

The short answer is "The tip should be set to positive (+).

I found an old Vector VEC127Y Spotlight. It appeared to be in perfect condition but the battery was dead and there was no charger. I was able to buy a replacement battery at BatteriesPlus for $21 USD. Here is the link for the battery
REPLACEMENT VECTOR VEC127Y BATTERY
I also purchased a Universal A/C adapter to use as a charger at BatteriesPlus for $17 USD. Their site does not list it yet but here is the manufacturers link. Please note the original battery was rated 6Ah. The replacement is only rated for 5Ah. Which means one less Amp hour (Ah). Which means a shorter run time, after charging, than the original battery had. Otherwise they are equal.
UNIVERSAL AC ADAPTER
I installed the new battery. I set the AC Adapter to 6V and installed the largest of the seven adapter tips that came with the charger, with TIP set to be positive (+). I opened the battery compartment of the spotlight and disconnected both the red (positive +) and black (negative -) battery leads from the battery. I then plugged the adapter tip of the Universal AC Adapter into the spotlight and plugged the AC Adapter plug to a power outlet. With a multimeter I tested the polarity of the spotlight battery leads while charging. I was able to confirm that the Adapter TIP should be set to positive (+). After reconnecting the spotlight battery leads and setting the AC Adapter to charge, I have a perfectly great spotlight in full working order.

It uses a Class 2 Transformer to charge the battery. The input is 120V AC 60Hz 9W. Output is 12VDC 300Ma.

http://www.tempestbatteries.com/html/tr6-6.html

Remove the black rubber ring from the face then unscrew the reflector. The replacement bulb is the same that goes in most common driving and fog light and may be purchased at most auto parts and Wal Mart stores.

You can purchase one at Black and Decker, they purchased Vector in 2006.

http://www.dewaltservicenet.com/Support/ServiceCenterLocator.aspx

http://www.dewaltservicenet.com/Support/ServiceCenterLocator.aspx

You can purchase all replacement parts here.

It sounds like your switch is defective, unfortunately Vector lights are Non-Servicable except for replacement bulbs, batteries and chargers, so I don't think it is worth fixing.

I need a new power supply for my Vector Spotlight, Model VEC127Y. Any suggestions as to where one can be purchased?
John [email protected]

6 Volts, here is info from site.
VEC127Y
VECTOR SPORT SPOT 1 MILLION CANDLE POWER CORDLESS-RECHARGEABLE SPOTLIGHT

• HIGH CANDLE POWER QUARTZ HALOGEN BULB DELIVERS A BRIGHT AND TIGHT BEAM
  
• AREA WORKLIGHT IN HANDLE PROVIDES UP TO 15 HOURS OF LIGHT WHEN FULLY CHARGED
  
• PROVIDES CONTINUOUS SPOTLIGHT USE FOR UP TO 25 MINUTES WHEN FULLY CHARGED
  
• HIGH IMPACT, BREAK RESISTANT ABS AND POLYCARBONATE HOUSING
  
• TOUGH, WEATHER RESISTANT AND BUILT FOR RUGGED OUTDOOR USE
  
• REPLACEABLE 6 VOLT, 6 AMP HOUR, NON-SPILLABLE, SEALED BATTERY
  
• LOCKING TRIGGER FOR ON/OFF LIGHT CONTROL
  
• INCLUDES AC AND DC CHARGING ADAPTERS
  
• INCLUDES BUILT IN HANDS FREE WORKSTAND