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 

3 minutes ago, Boondockboost said:

My intentions were to call them Tommorow about the problem, I tried to start it but it didnt get the fuel it needed to fire off so as of now ive yet to hear it run with the ecm

Did you open the fuel system at all?

2 minutes ago, dave110 said:

Got you covered.

 

EDIT

You're on fire tonight @dripley. Beat me out by a silly second.

My proof reads need improvement.

Of course the company i got mine from is on the complaint part of that thread lol

18 minutes ago, Boondockboost said:

My intentions were to call them Tommorow about the problem, I tried to start it but it didnt get the fuel it needed to fire off so as of now ive yet to hear it run with the ecm

Did you open the fuel system at all?

Nah I did not I was gunna wait till,tommorow if i got out of work early enough, 

If you did not open the fuel system anywhere that should not be reason for a non start. But it cannot hurt to open a couple of injector lines to see if you fuel to them.

 

But from my understanding if the lift pump isnt cycling wouldnt there be no fuel to the lines anyway?

If the system is primed it will run without a lift pump. Vp will draw it's own fuel, but it's not recommended above idle. 

3 hours ago, Boondockboost said:

But from my understanding if the lift pump isnt cycling wouldnt there be no fuel to the lines anyway?

At key the onthe ECM will bump the lift pump for a small prime, a second or so. If you bump the starter, no engine start,  the LP will run for 20 seconds or so.

 Is your WTS light coming on at key on?

Ahhh okay I see, yes I get wts and I had the lift pump kick on when I first tried to start woth new ecm but wouldnt come on after that 

5 minutes ago, Boondockboost said:

Ahhh okay I see, yes I get wts and I had the lift pump kick on when I first tried to start woth new ecm but wouldnt come on after that 

So if you bump the starter, no engine start, and leave the key on, the LP does not run for that 20 or so seconds?

Do you have a fuel pressure gauge?

Correct it does not cycle with a key bump. I dont have a fuel pressure gauge I just have the edge insight but I dont think it has a fuel pres gauge 

You need to check for power at the pig tail across the 2 pins in the connector. Bump the starter and see if you have power at the connector. If you do your LP is bad, if not it is in the ECM. Hopefully the rebuilder will stand behind their warranty.

Okay sounds good ill check it when I'm home. I hope so cause that will be shitty if them. 

Well got home and started to mess around with it a little. Noticed the relay plug had power so i figured must be a bad relay, swapped it out and the pump kicked on! Yippie! Except i noticed the wires at the relay plug started smoking, took a closer look at the old relay and noticed it was black. Obviously a problem there. I traced the wire that was smoking from the relay and it goes into a harness by the starter so I'm assuming it goes to the ecm? I was hoping my electrical problem was solved considering i dont know my way around wires at all. 

Mind you this raptor lift pump has been on the truck 4 years and never had an issue with wires smoking. 

Could the ecm be supplying to much power?

Did that wire go thru a 2 wire connector down to the loom near the starter. That is the one that ran the oe pump and it plugs into my relay harness for the AD pump relay.  Beyond that we are getting into my electrical midgetness.

The wire that smoked, was it yellow with white tracer?   If so then that is the power wire for the lift pump from the ECM.

I wanna say yes it goes to the factory connector but ill know for sure tommorow after work. I'll have daylight to mess with it. I didnt notice if it was yellow or not

15 hours ago, Boondockboost said:

Could the ecm be supplying to much power?

 

ECM can supply more power than the battery voltage. Most all functions of the ECM is just turn on and off the power to items.

6 hours ago, Mopar1973Man said:

 

ECM can supply more power than the battery voltage. Most all functions of the ECM is just turn on and off the power to items.

I believe he means cant and not can.

So i had a little,time to look at it some more. The wire that is melted is the power wire,to the lift pump. I checked all the wires made sure they werent chaffed or rubbed and grounding out . they seemed good. It just boggles my mind that this was all good before the ecm went bad. When i put a good relay in it seems like the pump struggles alittle and dosent sound like it did pre ecm faliure. Could the pump straining make the wire melt?