944Hybrids: 924/944/968 and 928 V8 Conversions
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HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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LM7 wiring Idea

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LM7 wiring Idea Empty LM7 wiring Idea

Post  Buddy2147 on Thu Apr 21, 2016 10:45 am

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!!

Buddy2147

Posts : 10
Join date : 2015-11-29
Age : 73
Location : Edmonds Wa

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LM7 wiring Idea Empty Re: LM7 wiring Idea

Post  spence on Thu Apr 21, 2016 11:14 am

That won't work... You've got a lot of reading to do!
spence
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LM7 wiring Idea Empty Re: LM7 wiring Idea

Post  Buddy2147 on Thu Apr 21, 2016 1:19 pm

seemed like such a good idea. Oh well back to the books!

Buddy2147

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Join date : 2015-11-29
Age : 73
Location : Edmonds Wa

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LM7 wiring Idea Empty Would have never worked!!!

Post  Buddy2147 on Sat Jun 25, 2016 4:32 pm

Now with engine pulled(out the top) would have never worked! ever!!
Now the fun begins

Buddy2147

Posts : 10
Join date : 2015-11-29
Age : 73
Location : Edmonds Wa

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LM7 wiring Idea Empty Wiring

Post  Buddy2147 on Mon Sep 05, 2016 11:35 am

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.

Buddy2147

Posts : 10
Join date : 2015-11-29
Age : 73
Location : Edmonds Wa

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LM7 wiring Idea Empty It is Alive!

Post  Buddy2147 on Fri Sep 28, 2018 1:16 pm

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! Very Happy

Buddy2147

Posts : 10
Join date : 2015-11-29
Age : 73
Location : Edmonds Wa

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LM7 wiring Idea Empty Re: LM7 wiring Idea

Post  matt889 on Fri Sep 28, 2018 3:27 pm

Buddy2147 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! Very Happy
i used the coil wires with the pin 14 connector , i pulled the coil wire together was fun Very Happy

matt889

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Age : 32
Location : canada Quebec

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Post  Rich L. on Fri Sep 28, 2018 11:18 pm

Nice! Congrats! Very Happy

Got those same humorless calls when mine first started. Cool
Rich L.
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