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TA_C10 · 04-12-2019, 04:41 PM

Guys this is great info thanks. Question. On my PCM wire harness. Its the blue green connector 2005 harness. PINS = BLUE 41, GREEN 33

Do I have these labeled wrong? Should this be:

A) FAN1 and FAN2
or
B) FAN LOW and FAN HIGH

In LT1swap.com pinouts, they say fan1 and fan2, but in his video I'm pretty sure he said low and high. His video is for a 2003 harness PCM but I think they are same as 2005. This is going to be important when choosing how to wire these up.

Another question. What guage wires did you use to wire up these relays?

1. 20awg for triggers?
2. 16awg for grounds?
3. 12awg for power?
4. 12awg for output to fans?

Oh, and what size fuses do these need? 30a for each relay, 40a for each relay? Or something else?

04-12-2019, 04:41 PM	#7
TA_C10 Registered User Join Date: Jun 2018 Location: Texas Posts: 1,353	Re: LS Swap - dual fan wiring Guys this is great info thanks. Question. On my PCM wire harness. Its the blue green connector 2005 harness. PINS = BLUE 41, GREEN 33 Do I have these labeled wrong? Should this be: A) FAN1 and FAN2 or B) FAN LOW and FAN HIGH In LT1swap.com pinouts, they say fan1 and fan2, but in his video I'm pretty sure he said low and high. His video is for a 2003 harness PCM but I think they are same as 2005. This is going to be important when choosing how to wire these up. Another question. What guage wires did you use to wire up these relays? 1. 20awg for triggers? 2. 16awg for grounds? 3. 12awg for power? 4. 12awg for output to fans? Oh, and what size fuses do these need? 30a for each relay, 40a for each relay? Or something else? __________________ TA_C10 Stage 1 build - http://67-72chevytrucks.com/vboard/s....php?p=8333444 "It's only money". Last edited by TA_C10; 04-12-2019 at 05:01 PM.