Ok so i got all the wires on the harness lengthened. and have no clue what im supposed to do for the alternator and the charging system wires. How do i wire that in.
Also the fuel pump. You just wire a wire from the + to the Pin 2 on the main relay correct?
and What do i do for the Ignition?
and thats all i need right? am i forgetting anything?
4g63 wiring help
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carguyf545
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- Posts: 175
- Joined: Wed Jul 27, 2005 12:41 am
- Location: centralia WA.
use this
http://www.vfaq.com/mods/ecu-harness-1G.html
there are two wires that need to get power to the ecu. pin 103 and 102, you can spice into them at the chassis to engine wireing conection. dont forget to ground pin 104.
i ran my own wire to the fuel pump, and didnt use any stock gages. i only hook up one wire to the fuel pump out of the 4 and it starter working, so i hope it is right.
http://www.vfaq.com/mods/ecu-harness-1G.html
there are two wires that need to get power to the ecu. pin 103 and 102, you can spice into them at the chassis to engine wireing conection. dont forget to ground pin 104.
i ran my own wire to the fuel pump, and didnt use any stock gages. i only hook up one wire to the fuel pump out of the 4 and it starter working, so i hope it is right.
Here is what I did for the fuel pump. I needed to look at the main relay pin out too (DJ has a pic on his white car page) to understand. I looked at the relay diagram and the ECU diagram in my Chilton to understand how it should work.
1) FUEL PUMP: Using the stock D50 starting circuit. Plan to connect the wire called "to starter relay" from the DSM main relay to the starter solenoid so it is hot when ignition in "Start" so relay allows the fuel pump (MSD inline) to run via pin 2 from the MR. Once running I assume the singnal from the ignition power coil into pin 109 will allow the signal from pin 56 (fuel pump control) to keep the relay closed. Not sure how pin 13 (fuel pump drive signal ) fits in but i'll be sure it is intact.
BELIEVE IT OR NOT THIS WORKS, FUEL PUMP COMES ON WHEN STARTER CIRCUIT IS HOT AND THEN STAYS ON IN THE IGNITION ON KEY POSITION AS LONG AS THE ENGINE IS RUNNING.
I have some diagrams and descriptions of my plan for the alternator and
starter circuit but they did not work correcty when I wired them-i figured it out but did not write down the solution and can't remember now. I think I did post it somewhere else here and I can look for it if you need it.
1) FUEL PUMP: Using the stock D50 starting circuit. Plan to connect the wire called "to starter relay" from the DSM main relay to the starter solenoid so it is hot when ignition in "Start" so relay allows the fuel pump (MSD inline) to run via pin 2 from the MR. Once running I assume the singnal from the ignition power coil into pin 109 will allow the signal from pin 56 (fuel pump control) to keep the relay closed. Not sure how pin 13 (fuel pump drive signal ) fits in but i'll be sure it is intact.
BELIEVE IT OR NOT THIS WORKS, FUEL PUMP COMES ON WHEN STARTER CIRCUIT IS HOT AND THEN STAYS ON IN THE IGNITION ON KEY POSITION AS LONG AS THE ENGINE IS RUNNING.
I have some diagrams and descriptions of my plan for the alternator and
starter circuit but they did not work correcty when I wired them-i figured it out but did not write down the solution and can't remember now. I think I did post it somewhere else here and I can look for it if you need it.
Brake boosters should NOT NOT!!!! see boost.
That would be awesome TJC if you could find it. I have been searching posts for info. but couldnt find to much info and if there was something i didnt understand it.
I want to get this thing running tom. so hopefully ill just need to figure out the charging system. Cause i have no clue what needs to be done.
I want to get this thing running tom. so hopefully ill just need to figure out the charging system. Cause i have no clue what needs to be done.
Ok, I've been staring at my diagrams (2 years old) and think i may have figured out what I was trying to do for the alternator circuit but can't be positive without looking at the truck.
There are three terminals on the alternator B, L and S (sometimes called R).
1) wire B goes directly to pos terminal on bat (I went through an 80A fuse under the hood)
2) wire L goes to the bat indicator light on the dash
3) wire S(R) spices with the wire L past the indicator light and then they both (as one spliced wire) splice into the ignition switch wire that is hot when the key is in position ACC, ON and START (blue wire in my switch). The voltage froom the ignition switch is from a 10A circuit in the cockpit fuse box.
Also, here is a more detailed description of what I wrote on the previous post...this is how the ECU gets power and runs the fuel pump via the main relay.
"Power to ECU comes two ways.
First, from the MPI relay. I wired pin 10 on the relay to the bat via a 60A fuse under the hood. This wire is always "hot" but the MPI kees it "off" until it gets the signal. The signal comes from pin 110 on the ECC that I wired to ignition "on". When ignition is "on", the 110 pin is hot and the ECU sends pin 63 to ground. Pin 63 goes to the MPI (via pin 8 I think) and the relay trigges thus pulling power from pin 10, sending it out pin 4 and 5 to ECU pins 107 and 102 (this triggers sensors, injectors and other stuff I am not clear on so the ECU can run the engine).
The next signal process occurs when the ignition is turned to "start". Pin 3 on the MPI is wired to ignition "on" to provide power for the fuel pump wire which leave from pin 2. But Pin 2 is not "hot" until it gets the ingnition "start" signal. This comes from ECU pin 108 which is wired to the ignition "start" wire. ECU pin 108, I think, signals the MPI relay via pin 9 tripping the relay and allowing power to the fuel pump via pin 2. Once the engine is running, the coil sends a signal via ECU pins 109 and then 56 to the MPI pin 7 that keeps the relay closed and power to the fuel pump as long as the engine is running. I wanted to keep the fuel pump saftey cutoff system intact.
By the way, pin 13 from the ECU is spliced into the Pin 2 output wire from the MFI-I can't remember why but it must power some ECU control system that is required when the fuel pump is operating.
Second, pin 103 on the ECU is hooked to an "always on" wire from the cockpit fuse box. This power justs keeps the memory."
good luck,
tjc
There are three terminals on the alternator B, L and S (sometimes called R).
1) wire B goes directly to pos terminal on bat (I went through an 80A fuse under the hood)
2) wire L goes to the bat indicator light on the dash
3) wire S(R) spices with the wire L past the indicator light and then they both (as one spliced wire) splice into the ignition switch wire that is hot when the key is in position ACC, ON and START (blue wire in my switch). The voltage froom the ignition switch is from a 10A circuit in the cockpit fuse box.
Also, here is a more detailed description of what I wrote on the previous post...this is how the ECU gets power and runs the fuel pump via the main relay.
"Power to ECU comes two ways.
First, from the MPI relay. I wired pin 10 on the relay to the bat via a 60A fuse under the hood. This wire is always "hot" but the MPI kees it "off" until it gets the signal. The signal comes from pin 110 on the ECC that I wired to ignition "on". When ignition is "on", the 110 pin is hot and the ECU sends pin 63 to ground. Pin 63 goes to the MPI (via pin 8 I think) and the relay trigges thus pulling power from pin 10, sending it out pin 4 and 5 to ECU pins 107 and 102 (this triggers sensors, injectors and other stuff I am not clear on so the ECU can run the engine).
The next signal process occurs when the ignition is turned to "start". Pin 3 on the MPI is wired to ignition "on" to provide power for the fuel pump wire which leave from pin 2. But Pin 2 is not "hot" until it gets the ingnition "start" signal. This comes from ECU pin 108 which is wired to the ignition "start" wire. ECU pin 108, I think, signals the MPI relay via pin 9 tripping the relay and allowing power to the fuel pump via pin 2. Once the engine is running, the coil sends a signal via ECU pins 109 and then 56 to the MPI pin 7 that keeps the relay closed and power to the fuel pump as long as the engine is running. I wanted to keep the fuel pump saftey cutoff system intact.
By the way, pin 13 from the ECU is spliced into the Pin 2 output wire from the MFI-I can't remember why but it must power some ECU control system that is required when the fuel pump is operating.
Second, pin 103 on the ECU is hooked to an "always on" wire from the cockpit fuse box. This power justs keeps the memory."
good luck,
tjc
Brake boosters should NOT NOT!!!! see boost.