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Fuse Buddy Mini Kit 309


Perfect for finding "parasitic battery draw", the ESI 309 Fuse Buddy Kit offers testing capabilities for all three major fused circuits. The tester can measure as high as 30A or as low as 100 milliamps.


  Shipping and Deliveries

Overnight options available at checkout. Weekday 2pm ET cutoff for same day shipping.

  Sales Tax

No sales tax unless shipping to Maryland

  Return policy

Money back guarantee on select parts if your problem is not resolved


The new design uses adapters for each fused socket, allowing for easy current draw measurements without having to break the circuit. The kit includes one Fuse Buddy tester with ATO end piece, a mini adapter, a micro adapter, and a socket adapter. Rather than offer a third Fuse Buddy with a new Micro end piece, these adapters can handle all three fuses. This kit includes 306B with ATO fuse fitting and the adapters making connection to the other two fuse types. This tool comes with a one-year manufacturer warranty. The battery is included. 


  • Tests all three fuse sizes: Micro, Mini and ATO circuits 
  • Plug in Fuse Buddy and read circuit amp draws 
  • Easy test connection into fused circuits 
  • Can be used on all circuits up to 30 Amps
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