928mac

Im installing the Tec-GT ECM

The instructions tell me to connect

The light green (fuel pump relay ground) according to the Tec CD

Carls manual say
Fuel pump and engine power supply wire

a. the light green gets spliced with a diode and connected to the (brown/red W15)
and also gets connected to the (Brown/white W21)

The problem is the diode did not get shipped with it and when I look at the wiring diag. something is not making sense.

I am trying to work around not having the diode

Any Ideas

928mac

Both W15 and W21 go to relay terminals #85, I wonder why they say install a diode on relay XX and not on XXV

the flyin' scotsman

can you post a pic of the wiring diagram?

928mac

K . . .ILL try

I got a link of the PDF.

Its sheet 10 the relays are at the bottom

http://www.cannell.co.uk/928_Worksho...%20Diagram.pdf

.

.

928mac

Fuel is in it and this is all thats left before I hook up the bat.

opps I lied, I have to take the rear spacers off and mount the rotors and your new to me wheels

the flyin' scotsman

sorry Brad.....I have hard and soft copies of the WSM.

I was asking about the wiring diag that came with all the parts

928mac

No diag. just what I stated in the first post

928mac

I took a pic of it if it helps Malcolm

928mac

I am trying to figure out why the LH relay xxv is even used except maybe for the shift valve.

Could the diode be required to eliminate the possibility of a spike back to the ECM when switched off.

RCinXS

DEPENDING on the diode, diodes can serve two main purposes.

1: Flow of current can only go one way. So yes, it could stop a reverse voltage spike.
2: A diode can be used to limit the voltage. Example would be 14 volt source, but only 8 volts are needed.

These examples are generic. I have no idea what the diode you need is supposed to do.

I suggest that you email or call Carl to find out what it does.

You need to call him anyway so he can send you the missing diode.

the flyin' scotsman

Power and zener diodes to name but a few.

Id be on the phone with the supplier also......I'll do some more reading l8r Brad to attempt assist

928mac

I decided to do some live test.

The Green wire from the ECM supplies 12 volts with key on but did not turn off.
The directions were to use power from relay XX11 which was called the LH relay.
This is wrong according to my schematic, the LH is XXV, correct?

the flyin' scotsman

The LH relay on a 89 is the XXV relay and is type '53'

XX11 relay is for the reverse lights (data from my relay chart)

928mac

Should terminal 86 on the fuel relay be grounded?

Where dose it leave the panel so that I can ground it there?

the flyin' scotsman

I believe it should be grounded.

30 and 87 are jumpered to run the pump for various tests: