Farmer Harv Posted April 20, 2010 Share Posted April 20, 2010 Hi all. I've been searching the forums for a while now and haven't found a thread related to my problem, so here goes...I have a 96 CH613 that I know absolutely nothing about. Bought it as a farm unit, and it only gets around 200 miles a year so haven't been worried about learning the ins and outs of Macks. Until now that is. Normally, when I turn the key off there's a second or two delay and then a "Click" sounds from the right side of the dash and everything then powers off. What has been happening more and more frequently is there is no delay & Click, but all electrical power is lost. To everything. No lights, no radio, no CB, no key, no starter...nothing. Then, within 5 minutes or so, electrical power will suddenly return and everything will work normally again.So I'm guessing there is a main circuit breaker that's seeing "something" intermittently when I turn off the ignition, but where is it? None of the breakers behind the right dash panel are labeled, but none of them seem big enough for the truck's entire electrical system anyways. Or am I barking up the wrong tree, and need to look elsewhere for the break in power?Thanks for any help! Quote Link to comment https://www.bigmacktrucks.com/topic/13515-total-loss-of-electrical-power/ Share on other sites More sharing options...
Mackpro Posted April 20, 2010 Share Posted April 20, 2010 Hi all. I've been searching the forums for a while now and haven't found a thread related to my problem, so here goes...I have a 96 CH613 that I know absolutely nothing about. Bought it as a farm unit, and it only gets around 200 miles a year so haven't been worried about learning the ins and outs of Macks. Until now that is. Normally, when I turn the key off there's a second or two delay and then a "Click" sounds from the right side of the dash and everything then powers off. What has been happening more and more frequently is there is no delay & Click, but all electrical power is lost. To everything. No lights, no radio, no CB, no key, no starter...nothing. Then, within 5 minutes or so, electrical power will suddenly return and everything will work normally again.So I'm guessing there is a main circuit breaker that's seeing "something" intermittently when I turn off the ignition, but where is it? None of the breakers behind the right dash panel are labeled, but none of them seem big enough for the truck's entire electrical system anyways. Or am I barking up the wrong tree, and need to look elsewhere for the break in power?Thanks for any help!Replace the big solinoid that is right in front of the fuse panel. This powers up everything that is turned on with the key switch. They carry alot of amps/heat so after a few years they start kicking out. They naturally get hot enough that you cant hold your hand on for to long (this is normal). We replace 1 or 2 a week. They made a couple different styles by many different vendors. Some of the first were black plastic, most now are round metal. Be sure to get one from a Mack dealer, we have some trucks come in with Ford starter solonoids on them, they dont last long. Quote Link to comment https://www.bigmacktrucks.com/topic/13515-total-loss-of-electrical-power/#findComment-53470 Share on other sites More sharing options...
Farmer Harv Posted April 22, 2010 Author Share Posted April 22, 2010 Replace the big solinoid that is right in front of the fuse panel. This powers up everything that is turned on with the key switch. They carry alot of amps/heat so after a few years they start kicking out. They naturally get hot enough that you cant hold your hand on for to long (this is normal). We replace 1 or 2 a week. They made a couple different styles by many different vendors. Some of the first were black plastic, most now are round metal. Be sure to get one from a Mack dealer, we have some trucks come in with Ford starter solonoids on them, they dont last long.Ahhh...thank you very much! I installed the new solenoid today and after a half dozen starts and stops it hasn't missed a beat! I owe you a beer or three. Quote Link to comment https://www.bigmacktrucks.com/topic/13515-total-loss-of-electrical-power/#findComment-53578 Share on other sites More sharing options...
Frank Montero Posted June 15, 2021 Share Posted June 15, 2021 My 2012 cxu612 is doing about the same as the above. I looked for the solinoid but couldnt find it .. Quote Link to comment https://www.bigmacktrucks.com/topic/13515-total-loss-of-electrical-power/#findComment-475235 Share on other sites More sharing options...
Frank Montero Posted June 25, 2021 Share Posted June 25, 2021 Now when I turn the key on the dash lights flicker ??? Quote Link to comment https://www.bigmacktrucks.com/topic/13515-total-loss-of-electrical-power/#findComment-475789 Share on other sites More sharing options...
Joey Mack Posted June 25, 2021 Share Posted June 25, 2021 you have a volvo/mack... so remove the triangle panel on top of the dash, under the C.B. posts and check the relay cubes for the issue.. Your ground wires are GRAY. Just incase you are checking them. there is a small group of grounds above the throttle pedal, to the right. You can look down through the top panel to see them and how to check them. Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/13515-total-loss-of-electrical-power/#findComment-475799 Share on other sites More sharing options...
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