944Hybrids: 924/944/968 and 928 V8 Conversions
Would you like to react to this message? Create an account in a few clicks or log in to continue.
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 …

Comments: 0

Latest topics
» 944 LS Conversion Parts near Charlotte, NC
Which relays? EmptyToday at 10:27 am by z1 zonly

» OneLap Brakes/Suspension for 951
Which relays? EmptyToday at 8:56 am by tomfree

» Slow shifting
Which relays? EmptyToday at 5:58 am by speedjw

» V8 Drivetrain transplant from 1983 to 1991
Which relays? EmptyToday at 12:54 am by sharkey

» pics of Hooker #2312 headers
Which relays? EmptyYesterday at 5:07 pm by turbobob924

» 968cs ls swap
Which relays? EmptyYesterday at 4:34 pm by mdan1

» fitment measurements
Which relays? EmptyYesterday at 2:17 pm by PorVetteNation731

» Don't know what this is
Which relays? EmptyYesterday at 10:01 am by gwistrup

» 85 5.3 swap
Which relays? EmptyYesterday at 1:01 am by PorVetteNation731

» Ls Engine mounts
Which relays? EmptySat Jul 31, 2021 4:53 pm by Plucky948

August 2021
MonTueWedThuFriSatSun
      1
2345678
9101112131415
16171819202122
23242526272829
3031     

Calendar Calendar

Log in

I forgot my password

Which relays?

4 posters

Go down

Which relays? Empty Which relays?

Post  fliermike45 Sat Sep 10, 2011 9:48 am

I have my SSP Wiring modified harness installed, it has it's own fan and fuel pump relays.

I am using the 944 A.C. with a F body compresssor, it's clutch is controlled from the GM computer and triggered by the 944 AC request line from pin 13 of the 14 pin connector. The Porsche switches located on the dryer are intact and hooked up.

Which unused Porsche relays can I now safely remove? (DME??)

PS The internal valve in the compressor has been disabled.

fliermike45

Posts : 778
Join date : 2009-09-19

Back to top Go down

Which relays? Empty Re: Which relays?

Post  Arthropraxis Sat Sep 10, 2011 12:38 pm

I took my DME relay and the fuel pump fuse out and everything is working fine.
How about all those connections at the + battery terminal. One of them IIRC goes to the DME for constant power. Could that or any others be eliminated?
Arthropraxis
Arthropraxis

Posts : 1103
Join date : 2009-09-02

Back to top Go down

Which relays? Empty DME Relay

Post  fliermike45 Mon Sep 12, 2011 3:04 pm

I have connected the LS1 compter fuel pump outlet (via a relay) to pin 4 on the 14 Pin firewall connector (Fuel pump).

Fuel pump runs fine unitil I remove the DME relay. My schematic shows that pin 4 goes direct to the fuel pump. Any ideas why pulling the DME relay kills the fuel pump? The fuel pump fuse #34 has been removed.

fliermike45

Posts : 778
Join date : 2009-09-19

Back to top Go down

Which relays? Empty Re: Which relays?

Post  Arthropraxis Mon Sep 12, 2011 6:47 pm

Did you tie in 87 off of the relay to the drivers side of fuse #34? I did mine like Xshop posted
https://2img.net/h/i94.photobucket.com/albums/l96/xschop/948Fuseblockandrelays-1.png
Arthropraxis
Arthropraxis

Posts : 1103
Join date : 2009-09-02

Back to top Go down

Which relays? Empty DME Relay

Post  fliermike45 Mon Sep 12, 2011 8:27 pm

Again....my schematic shows a direct line to the fuel pump from pin 4 on the 14 pin connector (T21).

This line runs via one end of relay #34 (xchop's driver's side) then on to the pump.

Fuse 34 has been removed so that line cannot be influenced by the DME relay.

The original use of this line was a voltage feed from fuse 34 back thru pin 4 of T21 to the oxygen sensor then on to the DME Control Unit.

There must be another connection to this line that does not appear on the schematic.



Guess I have to keep the DME relay.

fliermike45

Posts : 778
Join date : 2009-09-19

Back to top Go down

Which relays? Empty Re: Which relays?

Post  87-944S Mon Sep 12, 2011 9:33 pm

I installed a new relay and fuse for the fuel pump, I felt it was worth it to know exactly how it was wired. Cheap and didn't take long to do, no guess work. Smile
87-944S
87-944S

Posts : 744
Join date : 2009-06-10
Location : Maryland

Back to top Go down

Which relays? Empty DME Relay

Post  fliermike45 Tue Sep 13, 2011 1:27 am

I have already done that, just using an existing wire in T21

fliermike45

Posts : 778
Join date : 2009-09-19

Back to top Go down

Which relays? Empty Re: Which relays?

Post  Arthropraxis Tue Sep 13, 2011 6:40 am

You have yours wired exactly like mine and I don't need the DME relay in place for the new relay to run the fuel pump. I will check the pin on the mid harness later to make sure.
Arthropraxis
Arthropraxis

Posts : 1103
Join date : 2009-09-02

Back to top Go down

Which relays? Empty Re: Which relays?

Post  Arthropraxis Tue Sep 13, 2011 8:17 pm

I checked, mine is connected to the pin 4 at the mid harness. I am out.
Arthropraxis
Arthropraxis

Posts : 1103
Join date : 2009-09-02

Back to top Go down

Which relays? Empty Re: Which relays?

Post  xschop Wed Sep 14, 2011 12:17 pm

Mike, Arthro is right. Pin#4 is tied directly to the driver's side of Fuse #34
So you can toss the spade teminal from your +12v FP relay from fuse #34 and wire/solder it to Pin#4
xschop
xschop

Posts : 2710
Join date : 2009-06-09
Location : OKC

Back to top Go down

Which relays? Empty DME Relay......PROBLEM FOUND

Post  fliermike45 Wed Sep 14, 2011 5:35 pm

FOUND THE PROBLEM

My harness was modified by SSP and I ordered their relay panel that controls the Fans and the Fuel Pump. Power for this setup is taken from Pin 3 on the 14 pin connector T21. This is switched +12 volts. The source for this +12 volts is through the DME Relay. Pull the relay and the volts go to zero.

Must look for a different (and easy) source of switched +12 volts........any suggestions?

fliermike45

Posts : 778
Join date : 2009-09-19

Back to top Go down

Which relays? Empty Re: Which relays?

Post  Arthropraxis Wed Sep 14, 2011 5:54 pm

I got switched power from the drivers side of the radio fuse. You can get switched power from the ignition switch, also.
There is a two pin plug that goes to the factory alarm in the passenger side footwell. I was wondering if that has a switched and constant power. If so that would be a convenient location to pull power from.
Arthropraxis
Arthropraxis

Posts : 1103
Join date : 2009-09-02

Back to top Go down

Which relays? Empty Switched power

Post  fliermike45 Thu Sep 15, 2011 10:54 am

I'm having a problem tracing through the wiring diagrams.

What color is the wire on the Driver's side of Fuse 36....Factory Radio?

I believe the other side is red/white.

fliermike45

Posts : 778
Join date : 2009-09-19

Back to top Go down

Which relays? Empty Re: Which relays?

Post  Arthropraxis Thu Sep 15, 2011 11:49 am

It was a smaller gauge red/black stripe wire. You can get to it from the molex connector on the ignition switch, also. Several people suggested using a double fuse jumper.
Arthropraxis
Arthropraxis

Posts : 1103
Join date : 2009-09-02

Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum