Ton Posted December 12, 2021 Share Posted December 12, 2021 I just put a heated windshield and can't get a wiring harness. Does anybody know how I can wire it. I put a switch with a light in place of a timer but not sure what Amp size breaker to put in without burning out the windshield. Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted December 13, 2021 Share Posted December 13, 2021 I have never heard of a heated wind shield before so am of little to know help Might help if you can tell us make and model of vehicle it is in Paul Quote Link to comment Share on other sites More sharing options...
Ton Posted December 13, 2021 Author Share Posted December 13, 2021 its a 2004 mack granite Quote Link to comment Share on other sites More sharing options...
navypoppop Posted December 13, 2021 Share Posted December 13, 2021 Heated windshield or heated wipers? Quote Link to comment Share on other sites More sharing options...
Ton Posted December 13, 2021 Author Share Posted December 13, 2021 heated windshild Quote Link to comment Share on other sites More sharing options...
67RModel Posted December 13, 2021 Share Posted December 13, 2021 Did you get the windshield new or remove it from a junk truck? If you removed it you could get the VIN off the truck it was taken out of and go to dealer. They should be able to tell you some particulars regarding fuse size for the defroster. I have only ever seen the heated windshields on Mack Granites specd for government highway departments on their snow plowing trucks. Quote Link to comment Share on other sites More sharing options...
Ton Posted December 13, 2021 Author Share Posted December 13, 2021 thanks the mack dealer had them there from a township that didnt pick them up. they are not much help since they said the wireing harness is obsolete. Quote Link to comment Share on other sites More sharing options...
Mark T Posted December 13, 2021 Share Posted December 13, 2021 Maybe a smaller breaker would work ??? (like 15 amp) when it overheats it'll trip and then come back on after it cools off . Might be enough to get stuff sliding off the glass. Certain areas ? those trucks can be a problem in just the right storm when it comes to keeping the glass clear. Or maybe a fan might be a better idea ? Quote Link to comment Share on other sites More sharing options...
Ton Posted December 13, 2021 Author Share Posted December 13, 2021 ok thanks for the help Quote Link to comment Share on other sites More sharing options...
67RModel Posted December 13, 2021 Share Posted December 13, 2021 3 hours ago, Ton said: thanks the mack dealer had them there from a township that didnt pick them up. they are not much help since they said the wireing harness is obsolete. Thats kind of a shame on a few levels. First off its tough for me to understand that a 2004 is considered obsolete. I know its going on 20 years now but I still see piles of Granites on the road. I could understand not stocking too many Granite specific parts anymore but to be completely obsolete to the point where there is no information on it is questionable. I think you got a hold of a lazy parts man. My truck is a 94 RD and my dealer has no issue looking up any part for it. Hopefully that continues to be the case but I realize time moves on and you have to dig harder to keep your old equipment moving. Second, at least they guy at the dealer could have looked up the VIN of one of the township trucks these windshields were supposed to go into and at least tried to give you a fuse size. If the township had previously ordered parts for their trucks at that dealer then they would have been in their computer system.... Quote Link to comment Share on other sites More sharing options...
Popular Post Joey Mack Posted December 13, 2021 Popular Post Share Posted December 13, 2021 Volvo has already Killed Mack... But can't Kill guy's like us.. Jojo 2 1 Quote Link to comment Share on other sites More sharing options...
Mackpro Posted December 14, 2021 Share Posted December 14, 2021 I think I have a wiring diagram at work for the heated windshield on the granite. Hopefully I’ll remember to look tomorrow Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted December 14, 2021 Share Posted December 14, 2021 32 minutes ago, Mackpro said: I think I have a wiring diagram at work for the heated windshield on the granite. Hopefully I’ll remember to look tomorrow Does the glass it self have wires in it? 1 Quote glenn akers Link to comment Share on other sites More sharing options...
Ton Posted December 14, 2021 Author Share Posted December 14, 2021 it has connectors on each side Quote Link to comment Share on other sites More sharing options...
Mackpro Posted December 14, 2021 Share Posted December 14, 2021 3 hours ago, theakerstwo said: Does the glass it self have wires in it? I have never seen one in real life. Only in the option sections of wiring diagrams. I believe you can still order a new truck with it . 1 Quote Link to comment Share on other sites More sharing options...
67RModel Posted December 14, 2021 Share Posted December 14, 2021 The ones I've seen have the little heat emitters in them like the rear window defroster on a pickup truck or car. There are like 2 or three running parallel around the perimeter of the windshield. 1 Quote Link to comment Share on other sites More sharing options...
Mackpro Posted December 14, 2021 Share Posted December 14, 2021 After looking this morning the only wiring diagrams I can find are for 2007 and up MP engine equipped trucks starting with the CXP-CTP trucks and all the way to the newest trucks, looks to be a simple circuit with a 20 amp fuse feeding a dash switch and also a 4 prong relay , turn on switch and this activates the relay sending 12 to the windshield. You could get this in the standard 2 piece or one piece windshield. As far as the relay goes , I don’t know it it’s just a standard plain relay or one like the the heated mirrors and has a timer in it Quote Link to comment Share on other sites More sharing options...
Onyx610 Posted December 14, 2021 Share Posted December 14, 2021 Timed relay, Mack can still get you all the items you need for it. 2004 is by no means obsolete, we have no problem getting any part for our RDs and CVs….A lot of those windshields get ruined here in PA with the removal of inspection stickers. With the location of the stickers and the scraping with a razor blade, if your not careful you can cut the copper heating strip in it. 1 Quote Link to comment Share on other sites More sharing options...
67RModel Posted December 14, 2021 Share Posted December 14, 2021 Since he is retrofitting a truck that never had a heated windshield where would be a good place to pull key on 12V from to run to the switch? I would think you would want it to shut off with the key incase you forget to flip the switch off. He said he did not include a timer. I am not familiar with the Granite electrical system. 1 Quote Link to comment Share on other sites More sharing options...
Onyx610 Posted December 14, 2021 Share Posted December 14, 2021 They came factory with a timed relay, I do agree with you on wiring it that way. Plenty of spots to wire into. Then just do a switch, relay, and a circuit breaker like someone said. Quote Link to comment Share on other sites More sharing options...
fjh Posted December 14, 2021 Share Posted December 14, 2021 1 hour ago, Onyx610 said: They came factory with a timed relay, I do agree with you on wiring it that way. Plenty of spots to wire into. Then just do a switch, relay, and a circuit breaker like someone said. 14 hours ago, Mackpro said: I have never seen one in real life. Only in the option sections of wiring diagrams. I believe you can still order a new truck with it . I never saw one of these either ! never new it existed That said The new online crap wiring diagrams are Almost non existent for the older stuff and even if its there its a Dogs breakfast to look at! Volvo Trashers have totally dropped the ball when it comes to most of this stuff! 1 Quote Link to comment Share on other sites More sharing options...
Ton Posted December 14, 2021 Author Share Posted December 14, 2021 i want to thank everybody that took the time to help me out!!! now i have alot of great information. looks like i will be working on in this weekend. Quote Link to comment Share on other sites More sharing options...
Onyx610 Posted December 14, 2021 Share Posted December 14, 2021 I can give you the last six of the vin of one of the granites that has it Quote Link to comment Share on other sites More sharing options...
Ton Posted December 14, 2021 Author Share Posted December 14, 2021 that would be great Quote Link to comment Share on other sites More sharing options...
Onyx610 Posted December 14, 2021 Share Posted December 14, 2021 Ok tomorrow morning I’ll get that for you. Where are you located? 1 Quote Link to comment Share on other sites More sharing options...
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