Hey guys... I hope you can help me. My mother (73) has a 96 S10 Blazer. She resently had the engine replaced with a used 4.3 from a local guy. She drove it for about 2 weeks with no problems. One morning I had to move the Blazer so i could work on some of my junk. Started it, moved it, and parked it. Later I was going to go to the parts store, so i thought i would take her Blazer and it wouldnt start. Wont even crank. Tried to jump, with no luck. I guessed the starter was bad, so I brought it into the garage and replaced the starter. No change. My buddy told me to check for a blown fuse and sure enough, there was a 10a fuse marked crank, blown. Replaced the fuse, and it started... once. Now it continues to blow fuses, and wont start. I pulled the start wire (purple) and checked its condition and it seems o.k. (I expected to find it burned to the exhaust manifold but no such luck.) Even disconnected from the starter, it still blows the fuse. I've followed the wire up to where it goes into the large harness. Nothing seems crimped, burnt, or broken. I dont know what to check next. I hope someone has experienced this before and can help. Thx...OTR

 

The crank fuse is between the ignition switch and the park/neutral position switch. From there, it goes over to the starter relay. The problem is likely with either the park/neutral position switch or the starter relay itself.

I would start with swapping the starter relay with another relay like it on the firewall to see if the problem persists.

 

Thank you. I'll start there...

 

swartlkk... Thank you for the reply and the schmatic. I cant seem to locate the starter relay. I see the three on the pass side of the firewall, but my Hayes manual sayes these are for the AC. I swapped them around and still no change. I will use the schmatic you sent to try and relocate the correct relay and replace with a new one. If still no change do you think neutral switch? If this was bad would it cause the fuse to blow?? Thanks again for all your help...OTR

 

I checked the wiring harness going to the starter relay. All checked out except the yellow wire. When I test with a test light, it lights when I put power to it (grounded.) The schematic shows it goes to the NSS. I unplugged the NSS and retested the yellow wire and the yellow wire was no longer grounded. I tried to crank over the engine but the fuse still blew. I would think with the NSS disconected, it should act like i was trying to start in drive. No crank, no blown fuse. What do you all think? Thanks again for the help...OTR

 

am new and am going crazy trying to find out what wires are for that come out of nss harness

 

To the OP, sorry that this was missed and I hope you have resolved your issue, but if you haven't... If the fuse is still blowing with the NSS disconnected, it has to be a wiring issue.

Your original request for help has been moved to a NEW THREAD (<---CLICK) rather than to hijack a thread belonging to someone else. Please respond to the questions asked there. No response in this thread is necessary.