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05DodgeRam2500 12-21-2009 04:19 PM

New Rear window with defrost
Hello, I was out loading wood on Sat. and broke my rear window. Just had the broken slider window replaced with a solid heated rear window. Now I'm thinking about connecting the new rear window defrost to the same circuit used for the heated side view mirrors. This way when I select that button it will defrost my rear window too. I found the relay in the fuse box that turns on the heated mirrors. Now I'm wondering how I should connect the new rear window defrost? There probably is a fuse for the heated mirrors. I'm thinking one side of the rear window heater should be connect to this fuse. The other connection I'm not sure about. I don't have a wiring diagram or circuit layout to follow. That's what I need, and some advice on what I'm planning on doing. Tell me what you think. Thanks.

RamTech 12-21-2009 04:31 PM

I'd check first and see if there is existing wiring in the back for a rear defroster and in the TIPM where the rear defrost relay would normally go and see if the pins are in the socket. Trying to tap into the mirror circuit will overload it. Below is a diagram of how it comes wired from the factory.

05DodgeRam2500 12-21-2009 04:46 PM

Thanks for the diagram. Yeah looks like the rear window defrost needs a 25amp connection. Maybe I can still use the heated mirror switch to turn on both circuits at the same time? Looks like I'm gonna need another relay and a 25 amp fuse.

05DodgeRam2500 12-22-2009 05:10 PM

Pulled the back seats out today. Vacuumed up more glass. The window installers made a mess and didn't do a very good job of cleaning it up. Glad I didn't tip them.
Took out the interior plastic moldings and looked everywhere for the wires to connect to the rear window defrost. There were none, so I ran two wires 14gage out to the fuse box.
Where the relay plugs in there is metal tabs in the socket. Now I need to buy a relay and figure out where to make my connections? Not sure how to get to the bottom of the fuse box? Do trucks from the factory come with a separate switch for the rear window defrost? Need to buy a 25 amp fuse too.

Incognito 12-22-2009 05:18 PM

Damn! I never knew you can get a rear window with defrost! I have the solid window as well since I hate sliders. Man it would be great to have defrost on the back.

RamTech 12-22-2009 05:32 PM

I just went and looked at an '04 we have in the shop and if your rear defrost is on relay #68 then we're in business. The relay control is tied into the mirrors already and all you should need to do it obtain a relay and splice into the DB/WT wire, hook that to one side of the grid and ground the other. I have a feeling that since you didnt find any wiring for the grid already in place, that it leaves the relay and terminates at C136. You shouldn't need to worry with a fuse either if fuse 26 supplies power to the 30 terminal.

05DodgeRam2500 12-23-2009 02:58 PM

Thanks again Remerson228,
I went and got a relay at the local auto parts and I picked up a inline fuse. Pulled the fuse box out and found the DB/WT wire and spliced into it. Pulled the relay and tide my other wire to battery ground. Put everything back together, cleaned my battery connections, started the truck and turned on the mirror defrost. It took a while for the window to warm up. The mirrors heat up a lot faster. It's working, the back window gets warm.
The next time I need to plow snow it will be nice being able to see out the back window. The only time I have a problem seeing out the back window is when I'm plowing. Thanks again for the wiring diagram and checking the 04-Ram with the rear window defrost to see how it's setup from the factory.
Accidentally breaking my old rear window created some extra work for me but it should be worth it now. It hasn't been above freezing the last couple days but at least the sun was shining. Took about 8-hours total including vacuuming the whole truck and getting the parts needed to connect to the window. One day I'll have a garage, that will keep me dry and out of the wind while working on things. Seems like these projects and vehicle repairs always present themselves in the winter.
Merry Christmas & Happy New Year.

michael99 12-23-2009 03:23 PM

I'm not sure how the heated mirrors work on the 05 but on my 99 they only stay on for a farily short period of time, it may take longer to defrost the rear window. Hopefully yours will stay on longer than mine do.

RamTech 12-23-2009 03:28 PM

The difference could be in the grid itself, but the main thing is that it's working. Glad I could help.

MightyBlueRam 12-23-2009 04:15 PM

Jezz that diagram looks like something out of the space shuttle to me. Glad someone understands them because I sure don't. :doh:

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