piston Posted March 29, 2007 Share Posted March 29, 2007 the pcm red connector pin11 is what turns on the fan, i was told this wire connects to the relays ground pin#85, pin#86 is ignition hot and pin#88 is constant hot. then where does pin#30 on the relay go to??? im using a basic 30amp 4 prong relay. has small # 87-86-85 and #30 marking the pins or is this the correct way to wire it... red pcm connector #11 connects to pin#30 on relay pin#85 is regular ground (chasis) pin#86 is ignition hot pin#87 is constant hot i was told pcm red connector pin#11 connects to ground on relay to turn on the relay. the #11 pin on pcm, is that a neg or pos? Quote Link to comment Share on other sites More sharing options...
80LS1T Posted March 29, 2007 Share Posted March 29, 2007 The LT1 PCM relay wiring is deffinetly confusing. I didn't wire my up right the first time either. Here's how it should be though if I remember correctly.... PIN 85- Comes from pin A11 on PCM(ground through PCM) PIN 86- is power from IGN 12+ (10A fuse) PIN 87- is the power feed wire for your fan PIN 30- is power through a fuseable link from BATTERY+ Then all you need to do is connect a ground wire on the other side of your fan wiring.(This is for a single speed fan by the way). Here's some good info for LT1 wiring and relay wiring.... http://www.the12volt.com/relays/relays.asp http://www.datsun-280zx-lt1.com/LT1_WIRING_INFO.html Guy Quote Link to comment Share on other sites More sharing options...
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