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New ecm, no power at all

Boondockboost
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Boondockboost

Boondockboost

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Hey everyone, new to the forum i have a 99 eclb. I put a new ecm in after signs of a failed ecm, while I was waiting on the new one I pulled the alternator out to test it to avoid the bad diode problem. So I figured id do the mod w-t wrote about with the regrounds and new alternator power wire and what not. Well cut to I finshed it all up put the new ecm in and hooked the batterys up and i got nothing? No interior lights,headlights and no power at all. I had batterys tested and they were good. Cleaned all of my grounds again made sure everything was hooked up .checked over the wiring a few times im clueless now, im not good at electrical diagnostics, any idea of where to start?  Thanks for the advice 

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Marcus2000monster

Marcus2000monster

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3 minutes ago, Boondockboost said:

Hey everyone, new to the forum i have a 99 eclb. I put a new ecm in after signs of a failed ecm, while I was waiting on the new one I pulled the alternator out to test it to avoid the bad diode problem. So I figured id do the mod w-t wrote about with the regrounds and new alternator power wire and what not. Well cut to I finshed it all up put the new ecm in and hooked the batterys up and i got nothing? No interior lights,headlights and no power at all. I had batterys tested and they were good. Cleaned all of my grounds again made sure everything was hooked up .checked over the wiring a few times im clueless now, im not good at electrical diagnostics, any idea of where to start?  Thanks for the advice 

Make sure all ECM harness connectors are plugged in all the way. 

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Boondockboost

Boondockboost

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I'm gunna see if i can find a friend to help cause i know zero about electrical. I second guessed my self to even do the new ground change cause I really dont know much about electrical. From what I read from your simplified write up, you break apart the loom and cut the ground where it meets the 4 wire, ground those to the gear case and run a ground off the neg terminal to the same spot. Then run the alt power wire to the pass side pos terminal.? 

I ohm tested the fuses in the pdc all were good 

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dripley

dripley

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16 minutes ago, Boondockboost said:

I think you may be onto something with that 

That was it! I thought that was just the inline for the alternator I didnt know it powered it as well 

Good to hear. I knew it had to be simple with all power gone.

To all my friends here,:soap:

I AM AN ELECTRICAL GIANT!!!!

 

Back off the soap box now, I need to check all the pennies in fuse box to be sure they have not burnt thru yet. :gun:

 

Edited by dripley
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Boondockboost

Boondockboost

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Lol knowing my self it was something stupid i did or forgot, i appreciate it you saved me a ton of aggravation.

Now my only issue to solve is the lift pump isn't cycling before startup. It cycled one time for the first key up with the new ecm then nothing.

Lol knowing my self it was something stupid i did or forgot, i appreciate it you saved me a ton of aggravation.

Now my only issue to solve is the lift pump isn't cycling before startup. It cycled one time for the first key up with the new ecm then nothing.

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dripley

dripley

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12 minutes ago, Boondockboost said:

Lol knowing my self it was something stupid i did or forgot, i appreciate it you saved me a ton of aggravation.

Now my only issue to solve is the lift pump isn't cycling before startup. It cycled one time for the first key up with the new ecm then nothing.

Lol knowing my self it was something stupid i did or forgot, i appreciate it you saved me a ton of aggravation.

Now my only issue to solve is the lift pump isn't cycling before startup. It cycled one time for the first key up with the new ecm then nothing.

Oh i have been there just like you. Electrical is not my strong point by any means. I just knew it had to be simple. Thats why I enjoyed being a giant for that brief moment. I had pause about that wire when I did the mod. I did replace it with a new one from the parts house.

 I do know that the ECM controls that prime of the lift pump. So I am thinking that is an ECM problem. Who rebuilt your ECM? 

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Mopar1973Man

Mopar1973Man

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4 minutes ago, Boondockboost said:

Lol, I bought a new unit from an aftermarket company witch is proly a no no but i got it from all computer resources in florida 

 

Give these folks a shot. Handling my PCM problem quite well.

https://mopar1973man.com/forum/196-auto-computer-specialist/

 

I'll tag @Auto Computer Specialist to get them involved.

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dripley

dripley

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12 minutes ago, Boondockboost said:

Lol, I bought a new unit from an aftermarket company witch is proly a no no but i got it from all computer resources in florida 

Aftermarket is your only choice these days. I went thru this about 9 years ago. Getting help was almost non existant at the time. My experience was painful at the least.

 The above article has some known good rebuilders. I would star with contacting the rebuilder and and letting them know about the problem.

 Does the truck start ok? Have you tried to start it? 

 

 

I just noticed that is the wrong article.

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