KP2 Posted Saturday at 05:08 AM Share Posted Saturday at 05:08 AM I have been searching for manuals and wiring diagrams for my truck and the only ones I see(manuals) that may work are on eBay. The manuals are for a R600 truck. I am thinking that this is the 600 series and would include the RD688. Don’t want to buy the wrong manuals so any advice would be appreciated. Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/76232-1992-mack-rd688s-manuals/ Share on other sites More sharing options...
Joey Mack Posted Saturday at 12:57 PM Share Posted Saturday at 12:57 PM As far as manuals go, the engine, trans, and rears are seperate and generic for lack of a better word. The engine is a E-7 350, dont know the trans, the rears are likely 92/93 series. As far as wiring, I dont know what book that would be. If you have a 200 series mack transmission, i have the book for it, drive shaft, and the rears. I dont have an extra E-7 book. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76232-1992-mack-rd688s-manuals/#findComment-587027 Share on other sites More sharing options...
KP2 Posted 11 hours ago Author Share Posted 11 hours ago On 12/13/2025 at 6:57 AM, Joey Mack said: As far as manuals go, the engine, trans, and rears are seperate and generic for lack of a better word. The engine is a E-7 350, dont know the trans, the rears are likely 92/93 series. As far as wiring, I dont know what book that would be. If you have a 200 series mack transmission, i have the book for it, drive shaft, and the rears. I dont have an extra E-7 book. Thank you. The transmission is an Eaton 9 speed. I found a E-7 overhaul manual on Ebay so that is a possibility. I think maybe an owners manual that would layout what instruments were in the dash and just general information would be a help. The wiring behind the dash Is terrible. I really need a wiring diagram to try to work that out but in the end I may have to rewire to get the basic things working and be happy. I see books for 1997 RD and later but not the 1992 to 1997. Quote Link to comment https://www.bigmacktrucks.com/topic/76232-1992-mack-rd688s-manuals/#findComment-587107 Share on other sites More sharing options...
Joey Mack Posted 11 hours ago Share Posted 11 hours ago 97 is when V-Mac changed from 2 to 3, coming out in '98. A whole other animal.. i just packed up a bunch of my books during a home repair project. I may try to look for my drawings. I have a bunch. Quote Link to comment https://www.bigmacktrucks.com/topic/76232-1992-mack-rd688s-manuals/#findComment-587109 Share on other sites More sharing options...
Joey Mack Posted 4 hours ago Share Posted 4 hours ago KP2... I organized my library of shop manuals. Unfortunatley, the only wire diagrams I have are V-Mac 3, and 4, or the Volvo versions after 2007. I wish I could have helped you. Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/76232-1992-mack-rd688s-manuals/#findComment-587132 Share on other sites More sharing options...
Joey Mack Posted 3 hours ago Share Posted 3 hours ago I cant even find my notebook where i recorded all the pins on the bus bars on the firewall. That bugs me... my note books go back 25 years... Quote Link to comment https://www.bigmacktrucks.com/topic/76232-1992-mack-rd688s-manuals/#findComment-587133 Share on other sites More sharing options...
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