Wirlybird Posted January 2, 2022 Share Posted January 2, 2022 (edited) Hi all, New here and we have an older Mack we'd like to get some info on if possible. I tried using the VIN decoders, but they ask for a 17 digit VIN and ours is only 10 digits. VIN is RD686S7201 Thanks for any info and I am sure we'll be asking a bunch of questions! Edited January 2, 2022 by Wirlybird Quote Link to comment Share on other sites More sharing options...
880joe Posted January 2, 2022 Share Posted January 2, 2022 Welcome aboard I bet if you would post the complete vin# someone would help you out 2 Quote Link to comment Share on other sites More sharing options...
Wirlybird Posted January 2, 2022 Author Share Posted January 2, 2022 I changed it to the whole number. Thank you. Quote Link to comment Share on other sites More sharing options...
Steel Nose Posted January 2, 2022 Share Posted January 2, 2022 That truck was built 01/07/1980 That was before they were using the 17 digit vin numbers. ENDT676 engine (285hp) TRXL107 transmission (6 speed) 44,000 camel back suspension CRDPC92/CRD93 Carriers 4:17 ratio FA617C front axle Hope this helps 2 Quote Link to comment Share on other sites More sharing options...
Wirlybird Posted January 3, 2022 Author Share Posted January 3, 2022 8 minutes ago, Steel Nose said: That truck was built 01/07/1980 That was before they were using the 17 digit vin numbers. ENDT676 engine (285hp) TRXL107 transmission (6 speed) 44,000 camel back suspension CRDPC92/CRD93 Carriers 4:17 ratio FA617C front axle Hope this helps That is great info, thank you! Was there a model number/name? Like Rd? Quote Link to comment Share on other sites More sharing options...
Steel Nose Posted January 3, 2022 Share Posted January 3, 2022 Model is RD686S, And 7201 is the serial number 1 Quote Link to comment Share on other sites More sharing options...
Wirlybird Posted January 3, 2022 Author Share Posted January 3, 2022 10 minutes ago, Steel Nose said: Model is RD686S, And 7201 is the serial number Thank you! Quote Link to comment Share on other sites More sharing options...
Popular Post Wirlybird Posted January 3, 2022 Author Popular Post Share Posted January 3, 2022 A visual for anyone who might be interested! 9 Quote Link to comment Share on other sites More sharing options...
Wirlybird Posted January 3, 2022 Author Share Posted January 3, 2022 I failed to ask if I am posting in the correct group for this truck. Quote Link to comment Share on other sites More sharing options...
Brocky Posted January 3, 2022 Share Posted January 3, 2022 50 minutes ago, Wirlybird said: I failed to ask if I am posting in the correct group for this truck. Yes you are!!! Thanks for the picture!!! They are always welcome.. Just so you know this site has a large limit on picture size,, after while you will have to go thru a hosting site like Postimage.com or similar. 1 Quote Brocky Link to comment Share on other sites More sharing options...
Steel Nose Posted January 3, 2022 Share Posted January 3, 2022 As you can tell by my user name I love those steel nose RD's Quote Link to comment Share on other sites More sharing options...
Wirlybird Posted January 3, 2022 Author Share Posted January 3, 2022 8 minutes ago, Steel Nose said: As you can tell by my user name I love those steel nose RD's I was thinking exactly that! Quote Link to comment Share on other sites More sharing options...
Wirlybird Posted January 13, 2022 Author Share Posted January 13, 2022 Ok, got a question. I am redoing some wiring and I found that the volt gauge has 2 "grounds" going to it and 1 hot. Both grounds appear to go into the harness. Gauge works but is on all the time. Quote Link to comment Share on other sites More sharing options...
Wirlybird Posted January 13, 2022 Author Share Posted January 13, 2022 33 minutes ago, Wirlybird said: Ok, got a question. I am redoing some wiring and I found that the volt gauge has 2 "grounds" going to it and 1 hot. Both grounds appear to go into the harness. Gauge works but is on all the time. I think I figured it out. Now that I can see the back of the gauge better it looks like one is a chassis ground and the others are really a 12v line in and out. Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted January 13, 2022 Share Posted January 13, 2022 1 hour ago, Wirlybird said: Ok, got a question. I am redoing some wiring and I found that the volt gauge has 2 "grounds" going to it and 1 hot. Both grounds appear to go into the harness. Gauge works but is on all the time. Some trucks had the voltmeter working all time. And that is ok because it will not discharge your battery. Quote glenn akers Link to comment Share on other sites More sharing options...
Wirlybird Posted January 14, 2022 Author Share Posted January 14, 2022 1 hour ago, theakerstwo said: Some trucks had the voltmeter working all time. And that is ok because it will not discharge your battery. Ahh, ok. My friend though it used to go to zero when the truck shut off, but he isn't positive about it. We are trying to track down a battery drain. You can imagine the wiring nightmare in some areas on this truck! Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted January 14, 2022 Share Posted January 14, 2022 If the meter did go to zero at one time but will not now then that means some relay is staying on and maybe other things also so it would run battery down then. Quote glenn akers Link to comment Share on other sites More sharing options...
Wirlybird Posted January 14, 2022 Author Share Posted January 14, 2022 Do you really think the volt gauge would run off a relay? If there was a relay, any idea where it may be located? I am learning as I go on this truck! I did find one thing that was a drain. Someone had wired the A/C clutch directly to power so you connect the battery, it engages. Clip - solved! My current meter only does AC power draw so I can't test for any DC power draw. Quote Link to comment Share on other sites More sharing options...
Steel Nose Posted January 15, 2022 Share Posted January 15, 2022 That should run off the accessory relay that powers all the cab, it is mounted behind the dash. if you pull the ashtray panel off top of dash you can get to it from there Quote Link to comment Share on other sites More sharing options...
Wirlybird Posted January 15, 2022 Author Share Posted January 15, 2022 Thank you! We'll take a look once the temp get up a bit. Quote Link to comment Share on other sites More sharing options...
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