wiring help Rewiring but I cant identify this component - 1991 Silverado K1500 4x4

[Malicious_Apeman]

I am currently in the process of rewiring my old truck, I purchased a wiring harness but there was no place to wire in this small board. It was originally wired into the original harness, under the dash, next to the ECM. Can anyone help me identify what this is? Would it cause my truck to crank but not spark? A wiring diagram would be awesome as well.

 

[newdude]

Best I can find, its an ABS Diode.  

 

Don't think it would cause a crank/no start.

 

Are you sure the rest of the harness is correct?  Is everything plugged in?  

Edited May 14 by newdude

[Malicious_Apeman]

Honestly I am not sure if the rest of the harness is correct. It was a Painless 60101 and has been hard to find information on it. Everything seems to be connected, I have replaced the distributor and ignition coil. I see that the injectors are spraying fuel when the truck is cranked. I assume I am not getting spark but I'm not sure where the disconnect is. Looking to get an in-line spark tester today.

[biscaynekid]

Try grounding the lug.

[Malicious_Apeman]

I was able to get an in-line spark tester and when connecting it to the ignition coil I am not seeing it light up. Currently, tracing the wires back to make sure everything is connected correctly.

[richard wysong]

Do you have power at the coil+? Possibly you have the wires on the coil reversed? 

Edited May 15 by richard wysong

[Malicious_Apeman]

I was able to get the truck started and running yesterday afternoon. The ignition coil originally had two wires running to it solid pink and solid white. For some reason the white wire was keeping the ignition coil from sparking. When only the pink wire is connected, the truck starts with no issues... still investigating the white wire, which the wiring diagrams say should run to the tachometer.

[richard wysong]

White should go to - coil