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

Mon Jul 08, 2013 4:56 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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Wiring Questions

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Post  laptop_geek Fri Nov 18, 2011 11:03 pm

I may be just stupid, but I can't find out how to wire up the Fuel pump relay. I know what wire goes to it (A7, Red connector, DK GRN/WHT wire), but I can't find out where to splice that wire into the Porsche harness.

Wiring Questions Porsche%252520Wiring%252520Diagram%252520Fuel%252520Pump

Here is the wiring diagram from the haynes manual. It looks to me that I should splice it into the Gr/bl, R/Y, or R/bl wire, but what one. Any help is appreciated.

Edit: I have an early 944 with the 9 pin harness plug.
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Post  944-LT1 Fri Nov 18, 2011 11:40 pm

When you turn on the key now, doesnt the fuel pump turn on? If youre not adding your own relay and if the DME is still in the car, I guess Im not sure why you have to tap into the stock 944 system. It should still work as normal.

The black wire at pin 3 of the relay is 15A fused 12V+ switched (Key On)
The red/black of pin 2 of the relay is to 12V+ battery
The red/black at pin 4 of the relay turns to black/green after a 16A fuse and then to the fuel pump
The bk/gn wire at pin 9 goes the DME
The re/bl at pin 8 goes to the tach and re/ye at pin 8 goes to the DME

Wiring Questions Untitl10
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Post  laptop_geek Sat Nov 19, 2011 6:59 pm

944-LT1 wrote:When you turn on the key now, doesnt the fuel pump turn on? If youre not adding your own relay and if the DME is still in the car, I guess Im not sure why you have to tap into the stock 944 system. It should still work as normal.

The black wire at pin 3 of the relay is 15A fused 12V+ switched (Key On)
The red/black of pin 2 of the relay is to 12V+ battery
The red/black at pin 4 of the relay turns to black/green after a 16A fuse and then to the fuel pump
The bk/gn wire at pin 9 goes the DME
The re/bl at pin 8 goes to the tach and re/ye at pin 8 goes to the DME

Wiring Questions Untitl10

I wasn't planning on keeping the DME in the car. What other things will I need to modify because the DME is out of the car?

Why does the re/bl coming off pin 8 go to the tach? Should I wire pin 8 to ground and pin 9 to switched 12V+? Why is that second circuit in there anyway? If the ignition is on the fuel pump will be on due to the power off pin 3, correct?

I'll go out and set the battery in and see what happens when I turn the key.
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Post  spence Sat Nov 19, 2011 7:11 pm

All you need is two new relays. One for the fuel pump and one for 12v switch power. XSCHOP made a nice diagram... Follow this

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Post  laptop_geek Tue Mar 06, 2012 7:34 pm

Alright, after a little bit of a break (and two Yammers later) I am back working on the Porsche. What size wire should I use for the power to the fuse buses (two red wires coming from the battery to the fuses)?
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