 Early heater fan wiring question, with bonus mystery wire |
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| r3dplanet |
 May 31 2012, 08:43 PM
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Senior Member  Group: Members Posts: 679 Joined: 3-September 05 From: Portland, Oregon Member No.: 4,741 Region Association: None  |
My car has never had heat in the time that I've owned it. The car is a 1971 but the engine and wiring in the bay are all for 1973.
I took the time to completely refurb an early blower fan. It has two wires: one brown, one green. According to the wiring diagram I'm supposed to have wires directly from the harness to power it. I don't. Where am I supposed to tap for power? Also, on the relay board I have a mystery green wire coming from astern. I have no idea what it's for. Any guesses? See photos for clarity. Thanks, Marcus    |
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| r3dplanet |
Jun 5 2012, 12:45 PM
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Senior Member Group: Members Posts: 679 Joined: 3-September 05 From: Portland, Oregon Member No.: 4,741 Region Association: None |
By the time I finally got to matching up the parts I actually had, then answer finally shoved its way through my gray matter. But I doubt this will solve anyone's issue but mine unless you made the same mistake I made.
The mistake I made was ordering the wrong ignition harness. My car is a '71, but when I found out halfway through the re-wiring that I had a '73 engine I started buying '73 harnesses. So I ended up with a '71 injection harness and a '73 ignition harness. There's nothing wrong with this combo except that it precisely left me without fan hookup. So the green jumper in the 12-point ignition harness? Unnecessary in my case. Pin 11 should power the fan. Adding a jumper to pin 10 is worthless because on an early car like mine pin 10 goes to the Sportomatic (vaporware) transmission. So in reality pin 10 goes nowhere unless you have a '73 and later model. So I just opened up the connector and pulled the jumper. I de-soldered the connectors from the jumper, and re-soldered one connector to a new 3' length of green 12 gauge wire. From there it was a quick connection to the fan. And then, for the first time in probably decades, the heater fan worked. Photos:    (Yes, I'll tape these up). I still don't know what the mystery wire is for... -marcus |
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| falconfp2001 |
Jun 5 2012, 12:58 PM
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Pancho Pantera Group: Members Posts: 451 Joined: 5-December 10 From: Downey, CA Member No.: 12,456 Region Association: Southwest Region |
Hey Marcus,
I'd like to take those block-off plates off your hands? The ones to block off the heater hoses since I'm planning on removing all heat from the car. Congrats on the fix. |
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| r3dplanet |
Jun 5 2012, 02:14 PM
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#4
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Senior Member Group: Members Posts: 679 Joined: 3-September 05 From: Portland, Oregon Member No.: 4,741 Region Association: None |
Certainly. It will be a week or so before I have my tubes and what-not all ready to go. PM your coordinates and I'll send them along.
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Posts in this topic
spankmeister7 Early heater fan wiring question May 31 2012, 08:43 PM
McMark The 14 rolls of electrical tape on your harness se... May 31 2012, 08:55 PM falconfp2001 BTW nice engine bay. The circle is the harness tha... May 31 2012, 09:24 PM
spankmeister7 Thanks for the responses. As it is I have new Bowl... May 31 2012, 09:30 PM falconfp2001 Sorry, my bad. 73 comes from the 14 pin connector.... May 31 2012, 09:35 PM falconfp2001 BTW, whenever i have wiring problems this helps
h... May 31 2012, 09:38 PM Jeff Bowlsby Hi Marcus...so you're the Schpankmeister huh? ... May 31 2012, 10:15 PM spankmeister7
Hi Marcus...so you're the Schpankmeister huh?... May 31 2012, 10:52 PM etcmss I'm working on this today. A 71 body and harn... Jun 1 2012, 04:55 AM ThinAir
I'm working on this today. A 71 body and har... Jun 5 2012, 12:15 AM etcmss got delayed on my repair due to hot water heater f... Jun 6 2012, 03:54 PM |
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