let it loose Posted March 25, 2010 Share Posted March 25, 2010 My 1972 R Model dump blinker's will work and the hazard's come on, they just stay lit and don't flash. Does anyone know what controls the blinker and hazard's to flash? Quote Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/ Share on other sites More sharing options...
ThaddeusW Posted March 25, 2010 Share Posted March 25, 2010 My 1972 R Model dump blinker's will work and the hazard's come on, they just stay lit and don't flash. Does anyone know what controls the blinker and hazard's to flash?Bad flasher. Its a little round metal can looking thing that is usually near the fuse center and/or relays. It has just two pins and uses a heater and bi metallic strip to open and close a switch which flashes the lights. Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-51889 Share on other sites More sharing options...
MACKS Posted March 25, 2010 Share Posted March 25, 2010 Should be a three prong flasher most likely to the left of the steering wheel and just under the dash board. Quote Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-51890 Share on other sites More sharing options...
Packer Posted March 25, 2010 Share Posted March 25, 2010 Might try a cheap flasher first.They do go bad!Pull one out, push the new one in, and see if they work.There are two types.1)The bi-metal type(VERY cheap, $2-3.00 last time I bought one)2)Mechanical type.(Better, last longer, but more bucks - - - $25-30.00)Both are plug in, so the cheap one is the best for trouble-shooting.Once you put in in, just leave it.If it works, life is good.If not, use the old one for a spare and start looking deeper.Packer Quote Keep a clutchin' Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-51892 Share on other sites More sharing options...
let it loose Posted March 25, 2010 Author Share Posted March 25, 2010 Yeah i wasn't sure if it would have the same setup like some cars do or not. I will give it a look tomorrow and hopefully find it. I'm guessing these are the same one's you can find at a auto parts store? Quote Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-51893 Share on other sites More sharing options...
Rob Posted March 25, 2010 Share Posted March 25, 2010 Yup, the three prong style which is the heavy duty variant. The two prong style is usually reserved for lesser current draw of automobiles. This is in years gone past of course.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-51894 Share on other sites More sharing options...
Rob Posted March 25, 2010 Share Posted March 25, 2010 Yeah i wasn't sure if it would have the same setup like some cars do or not. I will give it a look tomorrow and hopefully find it. I'm guessing these are the same one's you can find at a auto parts store?Usually they are. Try to get one with a metal can as it radiates the heat away better than the plastic encased ones. This yields a longer service life.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-51895 Share on other sites More sharing options...
Packer Posted March 25, 2010 Share Posted March 25, 2010 Yes!!Same system!Packer Quote Keep a clutchin' Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-51896 Share on other sites More sharing options...
let it loose Posted March 25, 2010 Author Share Posted March 25, 2010 Well alright... thank you gentlemen! Quote Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-51898 Share on other sites More sharing options...
bobo Posted March 25, 2010 Share Posted March 25, 2010 You might be surprized to find the indactor lamps in the dash to be the problem, 4 ways will work but sign. will flash and stay on. james Quote Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-51910 Share on other sites More sharing options...
HK Trucking Posted March 25, 2010 Share Posted March 25, 2010 You might be surprized to find the indactor lamps in the dash to be the problem, 4 ways will work but sign. will flash and stay on. jamesA 1972 R model doesn't have indicator lights on the dashboard for turn signals.. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-51925 Share on other sites More sharing options...
Rob Posted March 25, 2010 Share Posted March 25, 2010 A 1972 R model doesn't have indicator lights on the dashboard for turn signals..Yes, most used a "'Signal-Stat" 500, or 900 series column mounted switch with two green indicators for the turn signals, and a red indicator for the hazzard flashers. All functions utilized the same bulb in the switch.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-51927 Share on other sites More sharing options...
let it loose Posted March 26, 2010 Author Share Posted March 26, 2010 Yes, most used a "'Signal-Stat" 500, or 900 series column mounted switch with two green indicators for the turn signals, and a red indicator for the hazzard flashers. All functions utilized the same bulb in the switch.RobYep, mine is the 900 series, the flasher was under the dash to the left. It's a two prong style and the problem was only a dirty connection. Works great now after a bit of cleaning! Quote Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-51953 Share on other sites More sharing options...
bobo Posted March 27, 2010 Share Posted March 27, 2010 You might be surprized to find the indactor lamps in the dash to be the problem, 4 ways will work but sign. will flash and stay on. jamesWhat year did they change to 'new'(late) dash style? I was still swimming back then. SO... ya maybe im wrong! james Quote Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-52029 Share on other sites More sharing options...
joes mack Posted March 28, 2010 Share Posted March 28, 2010 they changed the dash in late 73 for the 74 models my dads friends had 2 73 models one with the steel dash one with the plastic dash a friend of ours still has the one with the plastic dash. joe Quote Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-52075 Share on other sites More sharing options...
HK Trucking Posted March 28, 2010 Share Posted March 28, 2010 they changed the dash in late 73 for the 74 models my dads friends had 2 73 models one with the steel dash one with the plastic dash a friend of ours still has the one with the plastic dash. joeThe plastic dash started in 73, but the dashboard indicator lights for turn signals didn't come until about 84 on up.. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/13165-72-mack-r-blinker-problem/#findComment-52079 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.