Nelson Harness = Fail - Convert 1 Wire To 2 Wire?
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Nelson Harness - Convert 1 Wire To 2 Wire?
OK, I bought the harness for my rig, 2000 Tahoe (1 wire to pcm, 1 wire to AC). I'm also using a factory GM 05+ fan assembly.
I got everything installed last weekend and it worked flawlessly. Forgot to mention, I also have EFILive and tuned the pcm to turn on the fans. Again, worked perfectly, turned the fans on at 195, low speed, perfect. Then this morning it was a bit cold outside and needed to use the defrost, which of course kicks on the AC pump. No biggie, worked fine until about half way to work. Now the damn thing only works on low speed even when the AC pump kicks on. Also, I can watch my voltage gauge drop every time it trys to engage the AC so I turned the defrost off and continued on to work. Also smelled very hot at that time. I briefly checked it this morning after I got to work, the low speed fans still operate, didn't feel any hot or melted wires etc..
I realize it's still preliminary and I haven't actually checked the problem completely, but what all is involved with converting the harness to a 2 wire, pcm controlled setup? I read somewhere that it can be done, just didn't find any details about it. Something about changing the positive to negative output of pin 33 (or vice versa) using another relay?
At this point I don't care about not having the recirculation control, I just want a reliable fan setup that operates like it should.
Any help is appreciated.
Mike
I got everything installed last weekend and it worked flawlessly. Forgot to mention, I also have EFILive and tuned the pcm to turn on the fans. Again, worked perfectly, turned the fans on at 195, low speed, perfect. Then this morning it was a bit cold outside and needed to use the defrost, which of course kicks on the AC pump. No biggie, worked fine until about half way to work. Now the damn thing only works on low speed even when the AC pump kicks on. Also, I can watch my voltage gauge drop every time it trys to engage the AC so I turned the defrost off and continued on to work. Also smelled very hot at that time. I briefly checked it this morning after I got to work, the low speed fans still operate, didn't feel any hot or melted wires etc..
I realize it's still preliminary and I haven't actually checked the problem completely, but what all is involved with converting the harness to a 2 wire, pcm controlled setup? I read somewhere that it can be done, just didn't find any details about it. Something about changing the positive to negative output of pin 33 (or vice versa) using another relay?
At this point I don't care about not having the recirculation control, I just want a reliable fan setup that operates like it should.
Any help is appreciated.
Mike
Last edited by Mikey 97Z M6; 10-11-2014 at 05:25 PM.
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So has anyone converted their 1 wire harness to be a a 2 wire setup? I'd like to be able to control the high speed fans through the pcm and not some rinky dink, backwoods hill billy way using the ac trigger.
I wished I had done more research on this before pulling the trigger.
Mike
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i feel your pain. hopefully someone answers.
i might go with a factory harness if i come across another. kicking myself for not pulling it out of the truck i got the fans from. only 05+ ive seen at the self serve yards in last 2 year.
i might go with a factory harness if i come across another. kicking myself for not pulling it out of the truck i got the fans from. only 05+ ive seen at the self serve yards in last 2 year.
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Someone has to have done this conversion. Anyone? I really don't feel like paying another 125.00 for another harness. A wiring schematic on the 2 wire setup would probably work too.
Mike