7mg2 Posted March 9, 2015 Share Posted March 9, 2015 New here, not new to forums, or trucking though.My 1997 CH 613 I've had from new, and it now has 2 million miles on it.I have a speedo that will not register until up to about 50kph ( 30 mph) which is annoying and also creates and "electrical malfunction" from time to time. As I use odometer readings for IFTA fuel tax reporting, the inaccuracy of the odo is also costing me money.The above electrical issue with the speedo wouldn't be such an issue if the "Co-Pilot" display hadn't also quit ( some time before the speedo issues ) This started with the display going dark periodically, but revive able with a smart "whack" of the hand. Sometimes it would just flicker and then stay lit, but one day it just went dark and stayed that way.If anyone has any ideas about what the reasons for these issues might be, and have a way to fix them, I'd appreciate some feedback. Quote Link to comment https://www.bigmacktrucks.com/topic/39210-speedo-and-co-pilot-issues/ Share on other sites More sharing options...
GreenGiant2 Posted March 9, 2015 Share Posted March 9, 2015 I would think that not recording all the miles that it would be better than reporting all. Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment https://www.bigmacktrucks.com/topic/39210-speedo-and-co-pilot-issues/#findComment-282066 Share on other sites More sharing options...
gearhead204 Posted March 10, 2015 Share Posted March 10, 2015 try removing the speed sensor, (check the depth first before removing) then remove the fine debris from the sensor and reinstall. as far as the co-pilot check wire and ground connections. Quote Link to comment https://www.bigmacktrucks.com/topic/39210-speedo-and-co-pilot-issues/#findComment-282113 Share on other sites More sharing options...
7mg2 Posted March 10, 2015 Author Share Posted March 10, 2015 GreenGiant2..........not recording all miles screws with fuel mileage.........the only benefit comes when calculating ton mile, which is rare with IFTA.gearhead204....... a new sensor helped the speedo, but didn't eliminate the problem. It now wakes up at 20 kph instead of 50.The CoPilot is a plg 'n' play, so it's likely a dead display. Not sure if it can be repaired, but Mack will likely either not have one 'cos of the age of the truck, or want an arm and a leg for a new one. I'm on the hunt for a good used one. Quote Link to comment https://www.bigmacktrucks.com/topic/39210-speedo-and-co-pilot-issues/#findComment-282147 Share on other sites More sharing options...
GreenGiant2 Posted March 10, 2015 Share Posted March 10, 2015 gotcha 1 Quote We the unwilling, Lead by the unqualified, are doing the impossible, for the ungrateful. Link to comment https://www.bigmacktrucks.com/topic/39210-speedo-and-co-pilot-issues/#findComment-282164 Share on other sites More sharing options...
41chevy Posted March 10, 2015 Share Posted March 10, 2015 GreenGiant2..........not recording all miles screws with fuel mileage.........the only benefit comes when calculating ton mile, which is rare with IFTA.gearhead204....... a new sensor helped the speedo, but didn't eliminate the problem. It now wakes up at 20 kph instead of 50.The CoPilot is a plg 'n' play, so it's likely a dead display. Not sure if it can be repaired, but Mack will likely either not have one 'cos of the age of the truck, or want an arm and a leg for a new one. I'm on the hunt for a good used one.Sure it doesn't have a micro fuse in the unit? My digital dash died and it was the micro fuse that protected the display driver. Tiny 3 milimeter diameter x 7 milimeters long and only 2 amps. lHere is an example of what they look like. Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/39210-speedo-and-co-pilot-issues/#findComment-282174 Share on other sites More sharing options...
7mg2 Posted March 11, 2015 Author Share Posted March 11, 2015 Sure it doesn't have a micro fuse in the unit? My digital dash died and it was the micro fuse that protected the display driver. Tiny 3 milimeter diameter x 7 milimeters long and only 2 amps. lHere is an example of what they look like.0425645_932269.jpgHmmm...........I'll have to check that out, thanks Quote Link to comment https://www.bigmacktrucks.com/topic/39210-speedo-and-co-pilot-issues/#findComment-282215 Share on other sites More sharing options...
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