Manostihl83 Posted December 5 Share Posted December 5 Hey y’all brand new here and happy to be a part of the Mack truck site! Always loved big trucks and equipment since I was a little kid. First one I ever got to see close up was an old cab over freightliner that my grandparents had for their logging company when I was a little kid.Earlier this year I got hired at a local sand and gravel/ excavation company as a mechanic for everything and I love every minute of it! I’ve been wrenching all my life but I’ve never really enjoyed wrenching on anything as much as I enjoy wrenching on these old trucks and equipment, well besides classic cars and motorcycles that is. Our fleet of trucks are 2 98 cl series Macks, 2000 international 4900 tri axle, and a 99 Ken worth T800. Here is a picture of the truck I’m working on right now. It’s a cl713 with the E7-460 Mack engine. It’s randomly quitting and losing all power in the cab. I am not sure what the problem is. I’m told it could be the solenoid on the firewall next to the wiper motor 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/ Share on other sites More sharing options...
Joey Mack Posted December 5 Share Posted December 5 One if the wires on the relay on the firewall is cab power. It is on the post with 2 other wires. I assume you checked the battery cables and ends. You say the cab goes dead.. so nothing, not even the radio, horn dash lights, ect. Works? Does it have the acc. relay in the top center behind the dash panel? Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563313 Share on other sites More sharing options...
mowerman Posted December 5 Share Posted December 5 welcome aboard bud,,,have a ball,,bob 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563317 Share on other sites More sharing options...
70mackMB Posted December 5 Share Posted December 5 When does it lose power, parked or moving after hitting a bump? Follow what Joey has to say and check the cab ground also. .....Hippy 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563321 Share on other sites More sharing options...
Manostihl83 Posted December 5 Author Share Posted December 5 2 hours ago, Joey Mack said: One if the wires on the relay on the firewall is cab power. It is on the post with 2 other wires. I assume you checked the battery cables and ends. You say the cab goes dead.. so nothing, not even the radio, horn dash lights, ect. Works? Does it have the acc. relay in the top center behind the dash panel? Yes everything in the cab goes dead. Even the cig lighter when the key is on I only know that because it killed my power probe when the key way on. Even the lights on the truck and trailer weren’t functioning. I did check the battery cables and everything was kosher there as far as I could tell. I was able to put power to the battery wire pictured going to the fuse panel and the heater blower powered up and the truck would crank and fire up, but die seconds later. Idk if it was a fluke or what but my boss showed up and was able to keep the truck running by shutting the heater off and we got it back to the yard. The acc relay you’re talking about, is it behind the gauge cluster? Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563325 Share on other sites More sharing options...
Manostihl83 Posted December 5 Author Share Posted December 5 1 hour ago, mowerman said: welcome aboard bud,,,have a ball,,bob Thanks bob! Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563331 Share on other sites More sharing options...
Joey Mack Posted December 5 Share Posted December 5 if it has the type im thinking of, its under the cup holder, behind the switch panel.. I forget when they went from that type, to the cube type in the fuse area. there may be a vertical row of them to the left of the fuse panel. Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563334 Share on other sites More sharing options...
Manostihl83 Posted December 5 Author Share Posted December 5 (edited) 2 hours ago, 70mackMB said: When does it lose power, parked or moving after hitting a bump? Follow what Joey has to say and check the cab ground also. .....Hippy Doesn’t matter if you’re moving or not it will just quit and lose power in the cab. This morning it was 20 degrees and I fired it up cold without the heater blower on, it died almost immediately after it was running and lost power in the cab. I jumped the starter and let the starter motor run for a second , got back in it after I snuffed her with a little ether and she fired right up and ran. Edited December 5 by Manostihl83 Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563337 Share on other sites More sharing options...
Joey Mack Posted December 5 Share Posted December 5 I read this again, the heater fan thing is interesting, I know they draw a lot of amps. any chance you saw the alternator gauge when this issue happens? i'm curious if there was a major voltage drop, or even a spike.. Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563338 Share on other sites More sharing options...
Manostihl83 Posted December 5 Author Share Posted December 5 1 minute ago, Joey Mack said: I read this again, the heater fan thing is interesting, I know they draw a lot of amps. any chance you saw the alternator gauge when this issue happens? i'm curious if there was a major voltage drop, or even a spike.. I wasn’t looking unfortunately because my boss was in the truck. I had the switch panel under the ash tray and cup holder pulled today and didn’t see any relays in there but I will look again tomorrow. I did discover another fuse panel under the hood I didn’t know about though. The solenoid on the firewall has three wires running off of one side. One goes down to the starter solenoid I think, one goes into the cab, and the other goes to the fuse panel under the hood Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563339 Share on other sites More sharing options...
Joey Mack Posted December 5 Share Posted December 5 you are correct about the red wire routing. just for kicks, on the black relay looking thing next to the relay.... remove the single wire and put it on the other post and re-test.. that black thing is called a ground breaker... it's a major elec. part.. if it fails, you have what you have now. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563341 Share on other sites More sharing options...
Manostihl83 Posted December 11 Author Share Posted December 11 Well guys I found an old used solenoid and ground breaker in the barn and swapped em out and she still quits and does the same thing so I don’t know Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563791 Share on other sites More sharing options...
Mark T Posted December 12 Share Posted December 12 You do know it would need to be a continuous duty solenoid. Not a momentary one Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563793 Share on other sites More sharing options...
Manostihl83 Posted December 13 Author Share Posted December 13 On 12/11/2024 at 7:03 PM, Mark T said: You do know it would need to be a continuous duty solenoid. Not a momentary one Yes I know. It was a used solenoid and ground breaker off of the same model Mack Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563864 Share on other sites More sharing options...
Joey Mack Posted December 13 Share Posted December 13 I hate that I am forgetting things.. Do you have an injection pump with the electric gov. housing? Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563866 Share on other sites More sharing options...
Manostihl83 Posted December 13 Author Share Posted December 13 9 hours ago, Joey Mack said: I hate that I am forgetting things.. Do you have an injection pump with the electric gov. housing? It’s the E7-460 engine so I believe it does on the passenger side of the engine next to the eco Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563878 Share on other sites More sharing options...
Joey Mack Posted December 13 Share Posted December 13 If so, the duetch connector is know to have the terminals loosen and break contact. Make sure to secure it to the little bracket that holds it.. Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-563880 Share on other sites More sharing options...
Manostihl83 Posted December 15 Author Share Posted December 15 On 12/13/2024 at 6:38 AM, Joey Mack said: If so, the duetch connector is know to have the terminals loosen and break contact. Make sure to secure it to the little bracket that holds it.. I’ll check it out at work tomorrow thank you Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-564007 Share on other sites More sharing options...
880joe Posted December 15 Share Posted December 15 A 460 will be an etech 454 were the inline pump engines Quote Link to comment https://www.bigmacktrucks.com/topic/74825-new-member/#findComment-564024 Share on other sites More sharing options...
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