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Join Date: Feb 2002
Location: Chalfont Pa
Posts: 1,548
Problems(electrical)?

I had some running problems with my 1978sc which were cured with a new fuel pump. But after driving the car the first time I stoped it in my garage and now it won't start. I had some leaking fuel so I had to take out the fuel pump and fix the lines. When I tried to restart the car it would click and I heard some frying in the fuse box location. I have not been able to start the car and I'm not sure what is wrong. First question is what color lines go to what on the fuel pump. There is a brown line and a black line. Whcih one is + and which one is -? So atleast I can see if these are correct. When I first tried to restart the car the starter turned but not enough to start the car. I kept tring and then I only heard clicking. First I checked the battary and found it to be down on power so I ran it thru a deep charge cycle. Now battery is fine but car still won't start. WHen I try I here crackling near the fuse box in the front of the car. Almost seems like it is coming from the lines right under the fuse box. No visible marks on lines though. Now no click of soleniod just crackling in front with lines. What should I do next. Any one in PHilidelphia area who has some electrical expierance. I'm new to electrical problems.

Old 01-04-2004, 07:26 AM
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Join Date: Oct 2000
Location: sac, ca. usa
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Brown is -
black is +
do you get the same noise when you just turn on your ign switch ?
or only when you inguage the starter?
are your battery terminals dirty or loose?

Tim in Sac
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Old 01-04-2004, 08:55 AM
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Battary terminal was loose and I blew the big red fuse to the fuel pump. Reason I know is that when I try and start the car everything works except pump and whenI jump pump it runs thru the red fuse so I figured it out today thanks!
Old 01-04-2004, 04:00 PM
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Porsche Crest

The large Red round object is a relay ... get a couple of new ones so you will always have a spare on hand!

The Red relay can replace any of the Black ones, too ... so you only need to buy one kind of spare.
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Old 01-05-2004, 10:24 PM
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So the red and black relays are interchangable? They cost 27 bucks a pieace so if I can just use a black one I can take it from some where else instead of buying a new one.

Old 01-06-2004, 12:54 PM
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