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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Best place to tap "key on" power?

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Best place to tap "key on" power?

Post  joecitizennn on Thu Feb 09, 2012 7:26 am

What is the most preferred place to tap 12v for the ECM power supply? I have my fuse block for the engine management system located under the dash beside the stock 944 fuse block, but have been unsure of where best to tap the power to my box. Want to be sure it can carry the load. Any suggestions?

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Re: Best place to tap "key on" power?

Post  Admin on Thu Feb 09, 2012 7:28 am

What year model? Most of the time I get them at the key switch and run it to a relay that then powers the rest of the ad on fuse block for the harness.

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Key on power (switched +12 volts)

Post  fliermike45 on Thu Feb 09, 2012 12:52 pm

Simple way to get +12 volts switched power at Pin 1 of the late 944 14 pin connector is to jumper the two wires (black and green) that originally fed power to the ignition coil. This avoids using Pin 3 of the same connector as pin 3 receives its supply through the DME relay which can fail and strand you .
Works for me on my 88 NA 944. After doing this you can remove the DME relay.

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Re: Best place to tap "key on" power?

Post  joecitizennn on Thu Feb 09, 2012 7:30 pm

Car is an 87 924s, in other words it runs early 944 electronics. I built my own harness from caprice harness parts and it is strictly stand alone. It only draws power for ignition, fuel, sensors, and emissions excluding smog. What type of relay would work best. BTW I have hot wired it for a test and it runs absolutely awesome. This car is very close to done after only two months.

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Re: Best place to tap "key on" power?

Post  robstah on Thu Feb 09, 2012 7:42 pm

I used one of these on the radio fuse spot:

[You must be registered and logged in to see this link.]

Works fine and I didn't have to modify anything on the electrical side of the car.

robstah

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Load

Post  fliermike45 on Thu Feb 09, 2012 7:57 pm

Robstah,
Did you do a load analysis on that circuit, is it man enough for the job???
Just checking.

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Re: Best place to tap "key on" power?

Post  joecitizennn on Thu Feb 09, 2012 9:31 pm

robstah wrote:I used one of these on the radio fuse spot:

[You must be registered and logged in to see this link.]

Works fine and I didn't have to modify anything on the electrical side of the car.

Since I am running early 944 type electronics that will not work. The fuse box is under the dash and the fuses are cylindrical. I am a little leery of trusting the entire engine management, coil and injectors included to something so small.

joecitizennn

Posts : 46
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Re: Best place to tap "key on" power?

Post  robstah on Thu Feb 09, 2012 10:07 pm

joecitizennn wrote:
robstah wrote:I used one of these on the radio fuse spot:

[You must be registered and logged in to see this link.]

Works fine and I didn't have to modify anything on the electrical side of the car.

Since I am running early 944 type electronics that will not work. The fuse box is under the dash and the fuses are cylindrical. I am a little leery of trusting the entire engine management, coil and injectors included to something so small.

It's to power a relay.

[You must be registered and logged in to see this image.]

robstah

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Re: Best place to tap "key on" power?

Post  joecitizennn on Thu Feb 16, 2012 11:38 pm

what amperage of relay did you use?

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Re: Best place to tap "key on" power?

Post  robstah on Fri Feb 17, 2012 1:47 am

joecitizennn wrote:what amperage of relay did you use?

I ended up using a Ford 30A relay that has either a diode or resistor in it. I used [You must be registered and logged in to see this link.] for the fuse and relay block and followed the image made by xschop for the rest.

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