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projectRDM · 09-01-2006, 08:19 AM

SOHC, S13 DOHC, and S14 lower harnesses are all different. To add to that, the 97-98 differs from the 95-96 as it has a 4wire O2 sensor vs. a 3wire. The SOHC harness matches the SR in the main plug (OPS, VSS, etc.), the S13 DOHC is similiar but is only a 4pin, not a 6pin. The S14 plugs are nothing like the S13 or SR stuff.
Now, if you have an S13 DOHC or S14 you just use the existing lower harness, as it plugs into the underhood harness and all the connections are in the same place on an SR. For a SOHC, you can use the SR lower harness or modify the SOHC harness since the alternator and power steering are on opposite sides, basically it's just a matter of shortening a few wires.

Note that this works for both auto and manual cars, the only difference for an auto is you have to hardwire the reverse lights. And a manual harness, although it does plug in, is useless on an auto car since the wiring needed for reverse lights doesn't exist in the underhood harness where it would on a manual car.

09-01-2006, 08:19 AM	#5
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12)	SOHC, S13 DOHC, and S14 lower harnesses are all different. To add to that, the 97-98 differs from the 95-96 as it has a 4wire O2 sensor vs. a 3wire. The SOHC harness matches the SR in the main plug (OPS, VSS, etc.), the S13 DOHC is similiar but is only a 4pin, not a 6pin. The S14 plugs are nothing like the S13 or SR stuff. Now, if you have an S13 DOHC or S14 you just use the existing lower harness, as it plugs into the underhood harness and all the connections are in the same place on an SR. For a SOHC, you can use the SR lower harness or modify the SOHC harness since the alternator and power steering are on opposite sides, basically it's just a matter of shortening a few wires. Note that this works for both auto and manual cars, the only difference for an auto is you have to hardwire the reverse lights. And a manual harness, although it does plug in, is useless on an auto car since the wiring needed for reverse lights doesn't exist in the underhood harness where it would on a manual car.