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So I’m working on a 95 Chevy k1500 4×4 with the 350 TBI and 4L60E. My main issue is that when the transmission fuse is pulled, the wire from the ignition switch provides sufficient voltage (12-14). But as soon as I place the transmission fuse in, the voltage from the ignition switch drops to either 1.4 or 5.6 volts. Am I looking at a possible short? Or an ignition switch issue? I can provide more information as necessary. I will not replace anything until I can get some help to confirm (99%) what the issue is. Thanks for any help you can provide.
Engine: 1.5 years old; was a new crate
Transmission: New one swapped in 6 years ago
Total mileage on body: 220k
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I’ll back track everything relating to the transmission fuse and ignition tomorrow to double check. I found the voltage drop at the transmission fuse was due to a poor connection with the terminal for the fuse. Reinserted the wire all the way for the fuse block and my voltage was normal.
Sorry for the late response, I’m in the process of moving. I got the truck out of limp mode. I replaced the computer due to bad readings and replaced the ignition switch and it’s giving a better voltage reading.
Thanks for everyone’s help. I appreciate it (especially the wiring diagram and PCM voltage readings).
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