Need help with the name of electrical wire harness

[rcollamore]

Ok  so I have no idea what the name of this wire harness is it comes down from the my engine then splits into 3 separate wires looks like 2 of the wires goes to the starter then the 3rd goes to this white rubber tip that is sticking out from the bottom of the engine which this 3rd wire which is a male end connects to the female rubber tip.

I have to replace these wires because they are so corroded and that the 3rd wire I was talking about half of the plastic is gone so it barely says connected to the white tip.

I hope i was able to explain it the best let me know if you guys needs pics not a problem I can get them just been raining all day so I haven't had a chance to get a pic.

[bd]

Year/make/model?

Post a couple of pics.

[rcollamore]

Ya sorry about that probably help if I gave that info 1987 Chevy Suburban

[VileZambonie]

That thing sticking out of the cylinder block is the knock sensor. You can buy a pigtail for it. The other wires are fusible links

[rcollamore]

Ok thank you! If that is unplug will make it impossible to for the Chevy to turn over?

[VileZambonie]

No however your burned up fusible links will.

http://forum.73-87chevytrucks.com/smforum/index.php?topic=11972.0

[rcollamore]

Gotcha and you can't buy l the fusible links and the wire for knock sensor and just remove the crap and add the new wiring

[rcollamore]

Awesome link thank you!! The only reason I am asking about if I could buy the fusible links wire is because I don't own a  soldering tool

[Irish_Alley]

I know a soldered joint is more reliable but I don't see why a butt connector wouldn't work. But a soldering iron isn't too expensive $30
http://forum.73-87chevytrucks.com/smforum/index.php?topic=28681.msg239369#msg239369

[rcollamore]

 Well that's what's trying to go for is use butt connectors on those wire and buy the fusible links I don't mind buying a soldering iron i just wanted to find fusible links premade

[rcollamore]

Does any know what size those fusible links are?

[Irish_Alley]

Hard for me to guess. But if I had to it might be 12&14 ga. But might be 14&16

[LTZ C20]

As a rule of thumb I believe, and BD will probably correct me on this if I'm wrong. Fusible links are generally 2 wires sizes smaller than the size of the wire for the circuit they protect and they are made of different materials (I think). So a 12 gauge wire might be protected by a 16 gauge fusible link.

Or maybe it's 1 size smaller, pretty sure it's 1 or 2 sizes smaller. I'm not an electrical master technician.

[bd]

With some notable exceptions on medium duty GM trucks, a fusible link is always 6" long and 4 wire gauges numerically higher than the wire it protects.  So, a 10-gauge wire will be protected by a 6" long, 14-gauge fusible link; a 12-gauge wire will be protected by a 6" long, 16-gauge fusible link; a 14-gauge wire will be protected by a 6" long, 18-gauge fusible link; and a 16-gauge wire will be protected by a 6" long, 20-gauge fusible link.  Get the idea? 

According to the 1987 factory GM wiring manual, the two red wires in the image you posted are 3 mm² (which is a 12-gauge wire protected by a 16-gauge link) and 1 mm² (which is a 16-gauge wire protected by a 20-gauge link), respectively.  However, carefully inspect the wires to verify the actual gauge, because 16-gauge seems small and maybe a typographic error in the manual.

The pigtail for the knock sensor is an AC Delco PT308 (imaged below).  The knock sensor lead is 16-gauge dark blue with SXL insulation.  You should shield the wiring from excess exhaust heat and replace the heat shield for the starter if it is missing.

[LTZ C20]

Told ya lol. I was way off.