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LM7 wiring Idea
4 posters
944Hybrids: 924/944/968 and 928 V8 Conversions :: 944 Conversions :: 5.3 and 4.8 LS based Conversions
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LM7 wiring Idea
Need feed back if this a good Idea or not or even if it will work!
I have a 1988 N/A. Got a 2007 Silverado lm7 with the wiring harness and DBW.
I have read the entire forum and without a doubt the information is fantastic!
One topic I noticed is the wiring. The wiring harness is massive. It’s a real shame GM couldn’t make just a little bigger. What a mess!
Following the advice of many of the members, have reduced the harness
to a manageable state/mess.
The problem now is to integrate the two systems.
I was thinking I can have the lm7 harness run the motor(4 wire hook up) and the Porsche ECU run the car systems.
The ECU could run the starter, fuel pump, A/C (fortunately the A/c is Constant On).
The PCM would run the motor, the oil pressure , water temp, Tach.
It seems to me one would only have to add the PCM constant power direct to the bat and one wire to the ignition switch for starting and running.
What do you think? I welcome all feed back. I’m either right or a complete looney tune!!
I have a 1988 N/A. Got a 2007 Silverado lm7 with the wiring harness and DBW.
I have read the entire forum and without a doubt the information is fantastic!
One topic I noticed is the wiring. The wiring harness is massive. It’s a real shame GM couldn’t make just a little bigger. What a mess!
Following the advice of many of the members, have reduced the harness
to a manageable state/mess.
The problem now is to integrate the two systems.
I was thinking I can have the lm7 harness run the motor(4 wire hook up) and the Porsche ECU run the car systems.
The ECU could run the starter, fuel pump, A/C (fortunately the A/c is Constant On).
The PCM would run the motor, the oil pressure , water temp, Tach.
It seems to me one would only have to add the PCM constant power direct to the bat and one wire to the ignition switch for starting and running.
What do you think? I welcome all feed back. I’m either right or a complete looney tune!!
Buddy2147- Posts : 10
Join date : 2015-11-29
Age : 77
Location : Edmonds Wa
Re: LM7 wiring Idea
That won't work... You've got a lot of reading to do!
spence- Posts : 684
Join date : 2009-07-21
Age : 41
Location : St.Catharines, Ontario, Canada
Re: LM7 wiring Idea
seemed like such a good idea. Oh well back to the books!
Buddy2147- Posts : 10
Join date : 2015-11-29
Age : 77
Location : Edmonds Wa
Would have never worked!!!
Now with engine pulled(out the top) would have never worked! ever!!
Now the fun begins
Now the fun begins
Buddy2147- Posts : 10
Join date : 2015-11-29
Age : 77
Location : Edmonds Wa
Wiring
Worked out all wiring issues! was more tedious than diffucult. Have made it a complete stand alone. Fuel pump, A/C, Starter, alternator, fans. All have their own relays. wired hot/on to the Key and separate line to the fuse box. so far all checks out. removed the DME for fuel pump.
Was trying to install engine but soon found brake booster is in the way, so now it onto brakes.
Was trying to install engine but soon found brake booster is in the way, so now it onto brakes.
Buddy2147- Posts : 10
Join date : 2015-11-29
Age : 77
Location : Edmonds Wa
It is Alive!
Finally after 3 yrs it is running and quite well I might add!
A few thing occurred along the way.
Once I install the truck harness onto the car there was about 3-4 feet of extra wires. Way too long. It was every where. Was faced with the task of cutting them all and resoldering back together. That seemed frought with danger. So instead opted to go with PSI wiring harness #1015. Nice and clean. What I liked about the whole thing was the fuse block. Small and only two relays. Of course it meant I now have 4 very nice relays with all their wires sitting on the bench. Oh well. The fuel pump relay is wired except for the power and the fuel pump positive wire. You have to supply the wires. Pin 30 and pin 87. Easy.
One thing that always bugged me was no one wanted to use pin 1 (the coil wire) on the 14 pin connector.
After all it is a crank and run source. All one has to do is to join the two ends together and it will give a keyed 12v source. Hooked it to to their ignition source. Then all that that was left was to give a constant 12v to the harness itself. Hooked their starter wires together through a 30 amp fuse to the Bat. Turn the key and instantly started. Now I don't have an exhaust system yet(just the headers) so all the neighbors knew it started. Several calls. No humor!! Used the Porsche starting circuit, the oil pressure, and coolant temp wires. Am going to replace all of it with an Intellitronix Dash. Have already made the burled walnut plug that fits in front of the Porsche cluster.
All in All it was a Great Day!
A few thing occurred along the way.
Once I install the truck harness onto the car there was about 3-4 feet of extra wires. Way too long. It was every where. Was faced with the task of cutting them all and resoldering back together. That seemed frought with danger. So instead opted to go with PSI wiring harness #1015. Nice and clean. What I liked about the whole thing was the fuse block. Small and only two relays. Of course it meant I now have 4 very nice relays with all their wires sitting on the bench. Oh well. The fuel pump relay is wired except for the power and the fuel pump positive wire. You have to supply the wires. Pin 30 and pin 87. Easy.
One thing that always bugged me was no one wanted to use pin 1 (the coil wire) on the 14 pin connector.
After all it is a crank and run source. All one has to do is to join the two ends together and it will give a keyed 12v source. Hooked it to to their ignition source. Then all that that was left was to give a constant 12v to the harness itself. Hooked their starter wires together through a 30 amp fuse to the Bat. Turn the key and instantly started. Now I don't have an exhaust system yet(just the headers) so all the neighbors knew it started. Several calls. No humor!! Used the Porsche starting circuit, the oil pressure, and coolant temp wires. Am going to replace all of it with an Intellitronix Dash. Have already made the burled walnut plug that fits in front of the Porsche cluster.
All in All it was a Great Day!
Buddy2147- Posts : 10
Join date : 2015-11-29
Age : 77
Location : Edmonds Wa
Re: LM7 wiring Idea
i used the coil wires with the pin 14 connector , i pulled the coil wire together was funBuddy2147 wrote:Finally after 3 yrs it is running and quite well I might add!
A few thing occurred along the way.
Once I install the truck harness onto the car there was about 3-4 feet of extra wires. Way too long. It was every where. Was faced with the task of cutting them all and resoldering back together. That seemed frought with danger. So instead opted to go with PSI wiring harness #1015. Nice and clean. What I liked about the whole thing was the fuse block. Small and only two relays. Of course it meant I now have 4 very nice relays with all their wires sitting on the bench. Oh well. The fuel pump relay is wired except for the power and the fuel pump positive wire. You have to supply the wires. Pin 30 and pin 87. Easy.
One thing that always bugged me was no one wanted to use pin 1 (the coil wire) on the 14 pin connector.
After all it is a crank and run source. All one has to do is to join the two ends together and it will give a keyed 12v source. Hooked it to to their ignition source. Then all that that was left was to give a constant 12v to the harness itself. Hooked their starter wires together through a 30 amp fuse to the Bat. Turn the key and instantly started. Now I don't have an exhaust system yet(just the headers) so all the neighbors knew it started. Several calls. No humor!! Used the Porsche starting circuit, the oil pressure, and coolant temp wires. Am going to replace all of it with an Intellitronix Dash. Have already made the burled walnut plug that fits in front of the Porsche cluster.
All in All it was a Great Day!
matt889- Posts : 214
Join date : 2015-04-03
Age : 35
Location : canada Quebec
Re: LM7 wiring Idea
Nice! Congrats!
Got those same humorless calls when mine first started.
Got those same humorless calls when mine first started.
Rich L.- Posts : 928
Join date : 2011-05-30
Location : Seattle
944Hybrids: 924/944/968 and 928 V8 Conversions :: 944 Conversions :: 5.3 and 4.8 LS based Conversions
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