redlinemachmover Posted December 4, 2013 Share Posted December 4, 2013 Hello out there I have a 1999 Mack and the electrical malfunction comes on and it takes several time to start the truck up in the morning before it will stay on to idle, any idea. Quote Link to comment https://www.bigmacktrucks.com/topic/33750-electrical-malfunction/ Share on other sites More sharing options...
blackdog2 Posted December 4, 2013 Share Posted December 4, 2013 Coolant level!!! Quote Ed Link to comment https://www.bigmacktrucks.com/topic/33750-electrical-malfunction/#findComment-219869 Share on other sites More sharing options...
redlinemachmover Posted December 5, 2013 Author Share Posted December 5, 2013 Thank you I will check that.. If not what else can it be.. Quote Link to comment https://www.bigmacktrucks.com/topic/33750-electrical-malfunction/#findComment-219985 Share on other sites More sharing options...
theakerstwo Posted December 5, 2013 Share Posted December 5, 2013 a way to check that is pull wires off of coolant level sensor and install jumper wire on the wires to the ecm and that will tell you if the sensor is bad and that is saying your level is above the sensor.If it still dies ten get some one to read your codes. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/33750-electrical-malfunction/#findComment-219989 Share on other sites More sharing options...
staxx Posted December 5, 2013 Share Posted December 5, 2013 Oil psi sensor Quote Link to comment https://www.bigmacktrucks.com/topic/33750-electrical-malfunction/#findComment-219998 Share on other sites More sharing options...
redlinemachmover Posted December 6, 2013 Author Share Posted December 6, 2013 I will try them both.. Thank you.. Quote Link to comment https://www.bigmacktrucks.com/topic/33750-electrical-malfunction/#findComment-220160 Share on other sites More sharing options...
hicrop10 Posted December 15, 2013 Share Posted December 15, 2013 I had the same problem with my 79 rmodel.It turned out to be low on coolant.It has to be either the coolant leval or oil leval.Hell if your truck was newer it could be anything from you either gaining or losing weight to just about anything.These newer trucks have more sensors then anything.A friend of mine has a JD lawn tractor that has something like 7 or 8 safety sensor on it.The damm thing shuts off everytime he runs it hard on a hot day. Quote Link to comment https://www.bigmacktrucks.com/topic/33750-electrical-malfunction/#findComment-221621 Share on other sites More sharing options...
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