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Heating & Cooling 3rd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #11  
Old 07-12-2010, 07:56 PM
usafnewb usafnewb is offline
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Quote:
Originally Posted by Remerson228 View Post
I was referring to the actual terminal numbers on the relay itself. Terminal 85 should be hot with the key on and 86 is controlled by the PCM to supply a ground and close the relay contacts. Terminal 30 should also be hot with the key on and power will flow out of terminal 87 to the fan with the relay contacts closed.
I see. That is good to know when i go out and test the terminal myself. With that info, I can figure out which terminal is bad on the relay and how to jump it. I'll go check each terminal and post the results. Thanks for your help and patience on this.

Matt
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Old 07-12-2010, 08:16 PM
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I just tested the relay. Without the A/C on, there was power applied to terminal 85. Based on the normal relay operation, terminal 85 should only have power if the A/C switch is set to on. Terminal 30 should have power applied from the battery all the time. This terminal did not have power. The way I understand it, Terminal 30 supplies power from the battery which is only sent to the output terminal, 87, when terminal 85 is energized by turning on the A/C. Now what does it mean if terminal 85 has power w/o the A/C on but terminal 30 does not have power? Is there a short between the two? Can I open up the fuse box and fix the short? Can I use a jumper to fix the problem? I hope this info clears the situation up. Thanks!

Matt

Last edited by usafnewb; 07-12-2010 at 11:41 PM.
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  #13  
Old 07-13-2010, 07:35 PM
usafnewb usafnewb is offline
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Bump to keep this up top...really need help with this. Thanks!

Matt
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  #14  
Old 07-13-2010, 07:47 PM
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30 and 85 should both be hot with the key on. Ground is applied by the PCM throught terminal 86.
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Old 07-13-2010, 08:12 PM
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Quote:
Originally Posted by Remerson228 View Post
30 and 85 should both be hot with the key on. Ground is applied by the PCM throught terminal 86.
If 30 is not hot with the key on, can I jumper 85 to it so it is powered? Would it just be easier to wire the fan to the ignition so it is on as long as the truck is running?
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Old 07-13-2010, 09:15 PM
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According to the wiring diagram, that's how it is wired. It's possible that you have a corrosion problem or perhaps even a rodent has chewed the wire into. Pull up the IPM and check out the wiring underneath.
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Old 07-13-2010, 11:31 PM
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Forgive my ignorance, but what is the IPM? My mechanic says there is a short in the fuse box. Could there be a short within the box itself? A chewed wire is possible and I will check that.

Would it be better to just bypass the relay and wire the fan up to the ignition? I don't mind if the fan is on whenever the truck is running. It doesn't need to shut off until the truck shuts off.

Thanks!

Matt
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  #18  
Old 07-14-2010, 12:04 AM
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Integrated Power Module which is the fuse/relay block under the hood. Your "mechanic" needs to learn the difference between an open circuit and short circuit. If you really want to wire it up to run all the time, you can.
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  #19  
Old 07-15-2010, 10:43 PM
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Will connecting the fan to an Ignition source, so it runs whenever the truck runs, place undue load on the alternator?

I see there are spare relay terminals in the IPM. Could I wire the fan to a spare terminal? I assume all relay terminals are built the same and as long as I wire it up right, one terminal is as good as another...is this accurate? I'm just trying to find the best alternative to fix this problem without creating more problems. Thanks!

Matt
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  #20  
Old 07-15-2010, 10:54 PM
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Yeah, it will place more of a load on the alternator, but nothing it can't handle. If you want to rewire, you may as well use the compressor to activate the coil side of the relay and feed the fan from the battery.
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