cxn613 Posted July 30, 2013 Share Posted July 30, 2013 turn signals work until you turn headlights on. If you just turn clearance lights on the singals will work, it's just when you turn the headlights on it will make the signals quit. What could be causing this? thanks Quote Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/ Share on other sites More sharing options...
thomastractorsvc Posted July 30, 2013 Share Posted July 30, 2013 Check to see if the wiring has been hacked, if a new turn signal indicator was installed or head light switch or the flasher switch on the dash is in the right position Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/#findComment-196838 Share on other sites More sharing options...
cxn613 Posted July 30, 2013 Author Share Posted July 30, 2013 What I've found is the volt gauge wasn't reading anything, when i put a charger on the batteries it still didn't register any volts, but i tapped on the gauge and volts showed 13 to 14 then my signals worked with the lights on. The batteries are pretty much dead. Always have trouble with these six volts going dead. How hard to go to 12 volt system? Quote Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/#findComment-196862 Share on other sites More sharing options...
2stacksuperdog Posted July 30, 2013 Share Posted July 30, 2013 Its very simple to make it 12 volt. Take out the six volt batteries and put tin 12 volt except do not jump the batteries like you do 6 volt. With 6 volt you have to connect a + to a - to make 12 but with 12 volt batteries just put a jumper from the + to + and - to - so they are connected. Quote Matt Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/#findComment-196863 Share on other sites More sharing options...
thomastractorsvc Posted July 30, 2013 Share Posted July 30, 2013 The system is 12 volt, they used two 6 volt connected in series to make 12 volt, (4) 6volt batteries 2 battery each side. I have two 12 volt series 31 on each side. I may one day if it wont crank in the winter add two more battery's. If you put 12 volt batteries in it make sure to mark the positive and negative on each side. Mine were unmarked and it was a pain to trace. When you hook up the 2 new 12 volt battery's use the marked leads that go to the starter as if they were 6volt., That will make you 12 volts parallel to the starter. If you use (4) 12 volt battery's make sure when you tie the 2 battery together on each side it is positive to positive and negative to negative Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/#findComment-196864 Share on other sites More sharing options...
cxn613 Posted July 30, 2013 Author Share Posted July 30, 2013 So right now a negative from each side goes to the solenoid, and the positives from each side goes top the starter. If i put 12 volt batteries in, I'll connect the positives together and go to starter? And negatives together and go to solenoid? Quote Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/#findComment-196867 Share on other sites More sharing options...
thomastractorsvc Posted July 30, 2013 Share Posted July 30, 2013 Is yours positive ground? Mine is not and the (2) positive cables 1 from each side go to the + side on the solenoid and the (2) negative 1 from each side goes to the stud - on the bottom of the starter motor Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/#findComment-196868 Share on other sites More sharing options...
thomastractorsvc Posted July 30, 2013 Share Posted July 30, 2013 Mack went to standard negative ground on all highway models in 1977 Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/#findComment-196870 Share on other sites More sharing options...
cxn613 Posted July 30, 2013 Author Share Posted July 30, 2013 This is a 73 positive ground Quote Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/#findComment-196872 Share on other sites More sharing options...
thomastractorsvc Posted July 30, 2013 Share Posted July 30, 2013 I just looked it up, the book shows just the opposite, (2) Positive cables goes to ground stud on starter motor and (2) Negative cables go to solenoid Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/#findComment-196873 Share on other sites More sharing options...
thomastractorsvc Posted July 30, 2013 Share Posted July 30, 2013 have you thought of changing it to negative ground? Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/#findComment-196875 Share on other sites More sharing options...
cxn613 Posted July 30, 2013 Author Share Posted July 30, 2013 That's correct that's how mine is Quote Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/#findComment-196876 Share on other sites More sharing options...
rsb502 Posted July 31, 2013 Share Posted July 31, 2013 Wow, that sounds like a pain to get right, you need to swap to negative ground, so change all the guages, and engine wiring wires to the other post, the lights dont care. Then you would need to swap your batteries to two 12v 31s950's should start fine after that, I would add a battery disconnect switch just because if it were me then they wont be able to pull down in storage as quickly. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/32128-r-mack-light-problem/#findComment-196927 Share on other sites More sharing options...
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