Need help with ecm reflashing.

[nrose07]

My alternator is making a bunch of AC current after my grid heater relays stuck on last summer. I didn't replace the relays until this week so I didn't realize the ecm wasn't doing a preheat or fuel pump prime pre-start. I also remote start every morning so I didn't hear the fass fire off. So my questions.

1, I'm having my spare denso alternator rebuilt. But should I find a Bosch instead? They aren't subject to diode failure as easily.

2, Will the ecm continue to further fail past this point or will a new alternator halt the progression.

3, Who and or with what does it take to reflash a new/used ECM. Dodge/Cummins, high end scanner, Smarty, etc.

These questions Google and the forums haven't answered. Thanks for the feedback!


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[Marq92]

Different truck but my dad had his 300k mile alternator in his 04 rebuilt by his go to alternator/starter rebuilder. Been doing great for the last 15k miles. Aren't denso what the factory ones are? At least the starters I think. I'm not very knowledgeable on electronics but I'm pretty sure a smarty would do it just fine, just not sure if it would be the most cost effective option, don't know what the dealership charges or the typical charge from a scanner or which one would be needed.

[nrose07]

Denso and Bosch are both factory. The Denso unit are more common and are prone to having their diodes fail which creates AC voltage in a DC system.

[Marq92]

I did not know that.