Hi to all! I'm new and I have a problem with my dodge ram 2500 cummins (1999 yrs).At the morning when I go to turn on it, the ligth"wait to start" flash and the engine don't start until I disconnect the battery terminal and immediately reconnect it. From that moment engine work without problems.I hope someone of you can help me! Thanks

Welcome to the site. Are you getting any codes? I believe that you are looking at a bad ecm.

does it crank over and no start? or does it not even engage the starter?

does it crank over and no start? or does it not even engage the starter?

the starter runs and also the engine cranks but don't start.workshop cummins, here in italy, said to me that it is impossible to read the ECM because it doesn't appertain to that chassis.whit this i replay also to '98whitelightnin'. Thanks.

A little run down about ECM and Wait To Start light...When the key is twisted from OFF to ON and you normal see the wait to start light come on. There is several thing that have to happen for it to light up. first of all you got to understand the ECM is just like you home computer. ECm had a PROM (Programmable Read Only Memory) kind of like your hard drive, processor, RAM (memory), etc. So when that key is turned on the processor reads the PROM into RAM (booting) and then starts the software. One of the first task is to check IAT temps and see if grid heat is needed. Well when the Wait to stat light is lighting up is typically because there is a issue with the internal RAM and memory errors. So booting process is slowed way down trying to write the information to RAM. Eventually it does out right fail. As for a cause I finding that alternator AC noise is a big factor to electronic life span on these truck. You might have the alternator check as well as batteries and battery cables for problems too. Being the ECM and VP44 share the negative battery cable for ground.

A little run down about ECM and Wait To Start light... When the key is twisted from OFF to ON and you normal see the wait to start light come on. There is several thing that have to happen for it to light up. first of all you got to understand the ECM is just like you home computer. ECm had a PROM (Programmable Read Only Memory) kind of like your hard drive, processor, RAM (memory), etc. So when that key is turned on the processor reads the PROM into RAM (booting) and then starts the software. One of the first task is to check IAT temps and see if grid heat is needed. Well when the Wait to stat light is lighting up is typically because there is a issue with the internal RAM and memory errors. So booting process is slowed way down trying to write the information to RAM. Eventually it does out right fail. As for a cause I finding that alternator AC noise is a big factor to electronic life span on these truck. You might have the alternator check as well as batteries and battery cables for problems too. Being the ECM and VP44 share the negative battery cable for ground.

Thanks for the explaining Michael! in the coming days I'll check the battery and the alternator and i'll change the iat sensor! I'll update you!