m7 Attitude box problems

[whitdmilkman]

hey i have 2005 m7 build i am doing. I have the Attitude control box on it.
wired it in with a rectifier and compastior for my secondary injectors.
wired it up and fired it! ran on one cylinder so i switched the wires around and so it is firing on both cylinders. box calibrated so i went to bed. first thing in the morning sled fired and i went to pull it out of garage and sled died.
will not start switched wires everyway possible and all i can get is one cylinder and box wont light up or anything. put the stock injector wires back on injectors and fires on both cylinders.
I have the rectifier wired into a yellow wire on the hood harness. ground to the chassie grounded the rectifier plugged the attitude box into compasitor.
Am i missing something i am about ready to light a match and collect insurance!

 

[Tonysnoo]

When using a bridge rectifier on a sled, the output(pos or neg) can not be grounded to the chassis if the AC is still grounded. M7s have the AC grounded.

I don't know if that is your total problem, but, it prolly ain't helping matters.

When the AC source, like most sleds, is grounded and it feeds a bridge rectifier that is also grounded, one half of the AC wave form(1/2 the power) is shorted out. Its a good way to kill a stator or melt a bridge rectifier.

Hope this helps

 

[whitdmilkman]

so just ground through the brown wire on the sled? ( wich is ground of the sled)
or just have the recrtifyer grounded?
sound like something like this is my problem

 

[mt st helens]

If you used to run a boondocker box you must change the wires in the injector wire that goes to the dead cylinder. Switch the two wires going to the injector where they go into the connector.

 

[whitdmilkman]

I have switched them every way possible and only get it to run on one cylinder! The way I had it when they both wkould fire does nothing still.............................. got a match cause I am close to torchin her!!!!!!!

 

[Catman 42]

powering the box

Connect the red wire for the box to the red wire for the oem pump (splice in) then connect the ground to the chassis. the only thing you run on the rectifier circuit is the aux. fuel pump.

 

[whitdmilkman]

I thought the m7 were ac power throughout... is this wrong?
I need dc power to the attitiude box for the secondary injectors......

 

[mt st helens]

Connect the red wire for the box to the red wire for the oem pump (splice in) then connect the ground to the chassis. the only thing you run on the rectifier circuit is the aux. fuel pump.

Yes like Catman said for power(also run your o2 gauge from the stock fuel pump wire). But I am not sure if you know what I was saying about the injector wire. If you switch injector wires to your primary injectors and then other cylinder is dead then it is the problem that I was talking about. But this is only if you used to have a Boondocker box on the sled. I ran into this problem when I switched to a Attitude box from my Boondocker.

 

[whitdmilkman]

its got to be dc power its the same fuel pump as a m8 so i will just do it that way!

 

[whitdmilkman]

Yes like Catman said for power(also run your o2 gauge from the stock fuel pump wire). But I am not sure if you know what I was saying about the injector wire. If you switch injector wires to your primary injectors and then other cylinder is dead then it is the problem that I was talking about. But this is only if you used to have a Boondocker box on the sled. I ran into this problem when I switched to a Attitude box from my Boondocker.

I knew what you were saying.

 

[mt st helens]

OK. Good luck.

 

[JROD]

So what's the reason why you can't pull dc power from your rectifier to run your auxiliary injectors?

You have to watch how much power you are trying to pull out of the dc power circuit that was for the original fuel pump. There is a limited amount of power there.

 

[whitdmilkman]

So what's the reason why you can't pull dc power from your rectifier to run your auxiliary injectors?

You have to watch how much power you are trying to pull out of the dc power circuit that was for the original fuel pump. There is a limited amount of power there.

Thats what i really want to do! i took out my head lights and thought to just run my secondarys off them.. This is where i ran into my problem! I want to still run them from the hood harness. I think i might of messed the rectifier up when i grounded both. worked for a few minutes and then fried it or something. Shouldnt i get the box to work just from the injector signal like a pump gaser does.... Hook the box to ground on the chassie and the stock injectors should work.....

 

[JHG]

Do you have a resistor on your headlight circuit?

 

[JROD]

Thats what i really want to do! i took out my head lights and thought to just run my secondarys off them.. .

I would imagine you could have issues from high beam to low beam wouldn't you. I don't know. How much power do the auxiliary injectors need to operate effectively? I'm running OVS auxiliaries and chasing a fuel issue myself. I have mine powered off of the rectifier as well but I don't see why this can't work.

 

[Tonysnoo]

So what's the reason why you can't pull dc power from your rectifier to run your auxiliary injectors?

You have to watch how much power you are trying to pull out of the dc power circuit that was for the original fuel pump. There is a limited amount of power there.

You should be able to pull DC power off of the rectifier for the injectors or any thing else that you want to run. The condenser is also hooked to the positive and negative of the bridge to smooth out the DC voltage. Please, remember don't hook any part of the DC circuit to chassis ground.

Agreed on the DC power for the stock fuel pump. It is really limited and shouldn't feed any load more than about 1.5 or 2 amps max. My M7 wouldn't run more than 1.25 amps without a substantial voltage drop.

This is such a long winded subject it's hard to really splain everything about how electrons flow through all of these devises in a few paragraphs.

 

[JROD]

Okay, so my fuel controller is powered by the main injectors yet you also have to run ground from the box and tap into DC power for the auxiliaries. So what I'm getting from this is...... I have to ground the fuel controller to my rectifier ground instead of a chassis ground????

The box appears to be working fine but I'm lacking for fuel anything above 4-5lbs of boost which would make sense if my auxiliaries weren't working.

But if I move that ground over to the rectifier, will that affect the fuel controller operation. It's almost as if it's taking two power sources to run yet they are only using one ground which would make me think that it would be best to pull DC power from the original fuel pump plug and use that ground as well.

This could be the reason why the sled is only running good on one cylinder.... If you were grounding out the other injector.

 

[Tonysnoo]

Okay, so my fuel controller is powered by the main injectors yet you also have to run ground from the box and tap into DC power for the auxiliaries. So what I'm getting from this is...... I have to ground the fuel controller to my rectifier ground instead of a chassis ground????

The box appears to be working fine but I'm lacking for fuel anything above 4-5lbs of boost which would make sense if my auxiliaries weren't working.

But if I move that ground over to the rectifier, will that affect the fuel controller operation. It's almost as if it's taking two power sources to run yet they are only using one ground which would make me think that it would be best to pull DC power from the original fuel pump plug and use that ground as well.

This could be the reason why the sled is only running good on one cylinder.... If you were grounding out the other injector.

Hmmmm.....let's talk this through. Again, I don't know about the atitude box, but my PL box runs off of the power in the injector circuit for everything except the secondary injectors. The main injector circuit has it's own windings in the stator to power the circuits in the ECU. I guessing this makes them isolated from the lighting power, so "ground" has nothing in common with them.

That would lead me to believe that it just wouldn't matter where we source the DC for the secondary injectors.

Short answer, I would run the two leads right over to the bridge + and - . On my PL box I think black is negative.

Good luck and hope this helps.

 

[Tonysnoo]

This could be the reason why the sled is only running good on one cylinder.... If you were grounding out the other injector.

I think this is an unrelated problem having to do with the way the dolbec box is wired to the main injectors and you may have to switch the wires on the injector plug for the cylinder that seems not to work. I owe that lesson to Travis at OVS.

 

[JROD]

I think this is an unrelated problem having to do with the way the dolbec box is wired to the main injectors and you may have to switch the wires on the injector plug for the cylinder that seems not to work. I owe that lesson to Travis at OVS.

Very true. The Attitude and the Pure Logic are both built by Dobeck from what I understand. I also had to change around the wires on my injectors to make the box work but you change them around on the factory harness, NOT THE FUEL CONTROL BOX HARNESS. I will be moving my fuel controller ground to my rectifier ground to see if there's any difference. Thanks for the help Tonysnoo. Sorry to hijack this thread.