Nelson Harness = Fail - Convert 1 Wire To 2 Wire?
#21
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Glad you are happy with your painless harness but there are advantages to having the PCM to control the fans. With PCM control you also get fan control with A/C pressures. It works fine if you just avoid buying the 1 wire harness. Either buy the aftermarket 2 wire harness or get a factory harness from a 05-07 classic truck at a salvage.
who makes a 2 wire harness for 99-02?
#24
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Just order the 2 wire harness they sell for the 03+ trucks and put it on a 99-02. I think everyone that sells the 1 wire harness also sells the 2 wire harness. They just tell you that if you have a 99-02 you have to use the 1 wire harness and that is just wrong. It installs just like it would on a 03+. One wire to the blue pcm connector and 1 wire to the red or green pcm connector.
A quick google search came up with this one. I don't think I can say who sells it because they are probably not a sponsor.
Last edited by 2xLS1; 10-09-2014 at 09:32 PM.
#27
Why go thru all this frustration and not just call?
Why do we still make the 1-wire harness?
Because the second we tried retiring the harness, customers demanded we offer it.
We have made huge improvements to the harness, actually a while back.
Sealed, weather tight relays. If someone has had an issue with a harness and the new sealed relays were causing an issue, we haven't heard about it.
Be sure to go thru the troubleshooting process to determine if the harness is at fault, or not.
You can reach us at 210-626-0278
Why do we still make the 1-wire harness?
Because the second we tried retiring the harness, customers demanded we offer it.
We have made huge improvements to the harness, actually a while back.
Sealed, weather tight relays. If someone has had an issue with a harness and the new sealed relays were causing an issue, we haven't heard about it.
Be sure to go thru the troubleshooting process to determine if the harness is at fault, or not.
You can reach us at 210-626-0278
#28
Just order the 2 wire harness they sell for the 03+ trucks and put it on a 99-02. I think everyone that sells the 1 wire harness also sells the 2 wire harness. They just tell you that if you have a 99-02 you have to use the 1 wire harness and that is just wrong. It installs just like it would on a 03+. One wire to the blue pcm connector and 1 wire to the red or green pcm connector.
A quick google search came up with this one. I don't think I can say who sells it because they are probably not a sponsor.
A quick google search came up with this one. I don't think I can say who sells it because they are probably not a sponsor.
If the customer doesn't want to rid the truck from auto recirc, then they can not remove this wire.
Some 99-02 pcm's have this pin taken and some don't, and most customers don't feel comfortable removing this and losing the feature.
The pic you just posted; that's the type of relay and connector that allows contamination to cause contact issues.
That is the type of relay and connector we used years ago.
Here is our harness.
#29
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Every person I have edited the PCM for after installing your 1 wire harness was thoroughly pissed when they realized they were only going to get high speed fan operation when the A/C compressor engaged. And every one of them had never even heard of, or realized that their vehicle even had, or would even enter an auto air recirculation mode. There was a time when the tuning suites did not offer the ability to reassign the fan 2 pcm pin. Those days are gone. The days of selling the 1 wire harness should be too.
#30
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Why go thru all this frustration and not just call?
Why do we still make the 1-wire harness?
Because the second we tried retiring the harness, customers demanded we offer it.
We have made huge improvements to the harness, actually a while back.
Sealed, weather tight relays. If someone has had an issue with a harness and the new sealed relays were causing an issue, we haven't heard about it.
Be sure to go thru the troubleshooting process to determine if the harness is at fault, or not.
You can reach us at 210-626-0278
Why do we still make the 1-wire harness?
Because the second we tried retiring the harness, customers demanded we offer it.
We have made huge improvements to the harness, actually a while back.
Sealed, weather tight relays. If someone has had an issue with a harness and the new sealed relays were causing an issue, we haven't heard about it.
Be sure to go thru the troubleshooting process to determine if the harness is at fault, or not.
You can reach us at 210-626-0278
I also got your voicemail on Friday but it was too late for me to reach you. I am still interested in converting the harness to a 2 wire setup, matter of fact I have already changed the tune to accept fan 2 turn on with the pin 33 instead of auto-recirc.
I do tend to agree with 2xLS1 though, you should consider retiring this 1 wire design. Had I known i could have used the 2 wire setup and it was so easy to change the pin 33 assignment within the tune file, I would have just ordered the 2 wire harness. Like I explained above, people living in colder climates don't want the high speed fan coming on in the middle of winter when they are trying to defrost the windshield. It will make it nearly impossible to reach operating temps.
Mike
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