Spider injectors testing?

Tiny
KERRBEAR9180
  • MEMBER
  • 2000 GMC JIMMY
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
I have a spiders injectors that were taken out of my Jimmy I want to test them to see if they're good. I only have the injectors, no wires or any plugs that go into them. I wantbto test them with a 12v battery and I need to know, out of the 12 pins, which ones are positive and which ones are the ground. All 12 pins are silver.
Monday, April 20th, 2026 AT 12:43 PM

2 Replies

Tiny
STEVE W.
  • MECHANIC
  • 15,695 POSTS
These are the pin connections. Basically each 2 pin set fires one injector. BUT you have to be careful, they are normally pulsed open very rapidly and have fuel going through them to keep them cool. Without the fuel they will get heated very quick and can burn out.
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Monday, April 20th, 2026 AT 8:28 PM
Tiny
KERRBEAR9180
  • MEMBER
  • 2 POSTS
Thank you so much! The second image is exactly what ive been looking for for days! Is there any way to keep them from burning out when I test them? Again, they are not in the vehicle anymore and I will be testing them with a 12V battery. I dont have a multimeter, nor access to one. Or is there any other way I can test them?
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Monday, April 20th, 2026 AT 11:09 PM

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