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snakoil
Joined: 09 Feb 2010
Posts: 362
Location: Montreal, Canada
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 Posted: Fri May 25, 2012 5:45 am Post subject: is there a main fuse in my 924? |
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I have a 1979 924 NA
I was removing some PO custom wiring on ym car to bring it back to OEM
after a quick testing the car made like it was trying to start and then everything shutted down, no power anyware.
I tested the battery and validated all fuses in the relay box
I verified my wiring and I believe I should be correct.
Is there another fuse in the engine bay that might have blown or could it be one of the relay that blew?
right now turning the key does nothing at all on the car.
thanks
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staticsan
Joined: 19 Jan 2009
Posts: 450
Location: Sydney, Australia
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| Posted: Fri May 25, 2012 9:55 am Post subject: |
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That sounds like your ignition switch has failed, actually. I could be wrong.
Wade.
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'82 British NA - Which I think I've been very lucky with! |
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Luvmy80-924
Joined: 15 Mar 2012
Posts: 56
Location: PA
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| Posted: Fri May 25, 2012 10:16 am Post subject: |
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Probably a great place to start, check voltage in and out anyway.
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1980 924 N/A Everyday Driver
1986 930
And now a 1980 931 |
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Ozzie
Joined: 12 Mar 2005
Posts: 4448
Location: Townsville, Qld. Australia
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| Posted: Fri May 25, 2012 10:16 am Post subject: |
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corroded battery terminal?
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance |
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snakoil
Joined: 09 Feb 2010
Posts: 362
Location: Montreal, Canada
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| Posted: Fri May 25, 2012 11:08 am Post subject: |
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Battery terminals are good-ish
I tought of the ignition swith also tonight... I just don't have a clue how to troubleshoot this.
I guess i'll have to get a multimeter as my only wiring tool so far consist of a test light.
If i try to bypass the switch like they did in go e in 60 seconds would it work?
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Fri May 25, 2012 11:51 am Post subject: |
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| snakoil wrote: | Battery terminals are good-ish
I tought of the ignition swith also tonight... I just don't have a clue how to troubleshoot this.
I guess i'll have to get a multimeter as my only wiring tool so far consist of a test light.
If i try to bypass the switch like they did in go e in 60 seconds would it work? |
No power anywhere:
- Check your main ground to the firewall. If it is severely corroded it making a horrible connection you may very well get nothing. I've seen one so corroded that it looked just like dirt. At first I thought nothing of it, after I touched it with sandpaper I realized it was corroded. Ended up replacing it.
- Ignition switch can fail in different ways. You have a I/II/III on the ignition switch. I is off, II is on, III is start. Do you get /anything/ on II or III? A click? Anything? If not I would check grounds.
Here's a good place to start. Get a multimeter (test light will probably work). To see if your main ground is worth a darn touch the positive tester to your 12v on the battery. Then touch the ground tester to a chassis ground nearby. If you register nothing, your main ground is bad. If you see 12v pop up then it's fine.
The battery to firewall ground has a tendency to rust under it if there is any rust issues on the car, and with time, could eventually have enough resistance that it simply stops making a connection all together.
Since there is not a "main fuse", it's safe to say if /nothing/ is working there is a huge break somewhere in the harness, or the terminal, or a ground. It is very possible that you could have something like the headlights working, but have no dash lights. Or perhaps you could have the wipers working, but have no headlights, etc etc... there are many separate circuits.
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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snakoil
Joined: 09 Feb 2010
Posts: 362
Location: Montreal, Canada
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| Posted: Fri May 25, 2012 8:17 pm Post subject: |
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I'll check the ground tonight
Like I said I got nothing at all, no electronic clickin sound when I turn the key and no wiper, dash, headlights. the car responds the same way as when I have the battery disconnected.
I'll keep you guys informed of what I find tonight
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1979 924 NA |
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Fri May 25, 2012 8:19 pm Post subject: |
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best of luck to ya!
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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staticsan
Joined: 19 Jan 2009
Posts: 450
Location: Sydney, Australia
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| Posted: Fri May 25, 2012 8:41 pm Post subject: |
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I'm guess a little bit, but I noticed on my car that there is a threaded hole near the battery probably intended for the ground cable. However, a previous owner had put a longer cable on and terminated it instead where the engine is also grounded to the body - on the mount for the coil.
It's probably the only really good thing a PO has done on my car, but it does suggest that the original, factory-fitted ground point was really not such a great choice.
Wade.
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'82 British NA - Which I think I've been very lucky with! |
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snakoil
Joined: 09 Feb 2010
Posts: 362
Location: Montreal, Canada
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| Posted: Sun May 27, 2012 10:52 am Post subject: |
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Thank you guys!
I got my testlight out and started looking at ignition wires
And never got anything, wondering if my testlight was
Working i tried directly on the battery connectors.
Seems my positive battery connector was more than just dirty on the outside.
After a quick sandpaper work i now got power again!
I do have a fuse that blows when turning the key but that will be for another day.
Thank you for your guidance guys, it helped a lot as i would have never doubted a battery connector.
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