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strange electrical problem

Hopefully someone has heard of this.My reverse lights don't work,fuses good,bulbs good,I can put 12v to the grey/brown wire at the switch and the lights come on.I think my problem is the supply?Lastly when I put it in reverse the druck pressure goes to "0".....Thanks for listening. 87 930 in case I forgot to mention..
Old 11-09-2009, 12:41 PM
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What about the switch at transmission itself? Easy to check using Ohmmeter
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Old 11-09-2009, 02:06 PM
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Quote:
Originally Posted by speednut View Post
Hopefully someone has heard of this.My reverse lights don't work,fuses good,bulbs good,I can put 12v to the grey/brown wire at the switch and the lights come on.I think my problem is the supply?Lastly when I put it in reverse the druck pressure goes to "0".....Thanks for listening. 87 930 in case I forgot to mention..
What pressure??? Is that like Quantum Physics lingo?

My guess is you have a bad switch.
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Old 11-09-2009, 02:29 PM
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ohmed the switch , its working properly,its new.
Old 11-09-2009, 02:31 PM
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I've seen this before...

Speednut

I've seen a thread on this before (pressure going to 0 when reversing)...

Unfortunately memory (and bladder) is like a sieve and could not find it if my life depend it on it.

Should get a solution before the Sun rise in the East.

J.J.
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Old 11-09-2009, 03:51 PM
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speednut..

Sounds like you need an electrical diagram. If you ask nicely in this forum someone should be able to help you out with a print. The oil pressure sending unit works on resistance and is not in the same circuit as your back-up lamps.
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Old 11-09-2009, 04:19 PM
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I have a diagram,this is the strangest thing I've seen..I have never had an electrical problem that I have not been able to fix ,but makes no sense...........It's all most like someone has messed with it ! Some how connected wires wrong..
Old 11-09-2009, 05:24 PM
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Quote:
Originally Posted by speednut View Post
It's all most like someone has messed with it ! Some how connected wires wrong..
Trust me this is very possible.
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Old 11-09-2009, 06:49 PM
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Porsche Crest Before the Sun rise...

Quote:
Originally Posted by JJ 911SC View Post
Speednut

I've seen a thread on this before (pressure going to 0 when reversing)...

Unfortunately memory (and bladder) is like a sieve and could not find it if my life depend it on it.

Should get a solution before the Sun rise in the East.

J.J.
Found it...

May not be your problem but there is something in common between the Oil Pressure gauge and the back-up light.

Check entry # 6 & 8 of Oil pressure gauge pegged (ignore the title)
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Old 11-10-2009, 01:52 AM
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Thanks JJ911SC!! I think someone messed with it..Thursday I'll check that,betcha any thing the wires got switched..
Old 11-10-2009, 06:02 AM
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Quote:
Originally Posted by speednut View Post
Thanks JJ911SC!! I think someone messed with it..Thursday I'll check that,betcha any thing the wires got switched..

Keep us posted...
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83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger
Old 11-10-2009, 06:03 AM
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OFF THE BOOST PIPE NOW...
 
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Did you or someone work on your car recently? Or did I miss that in your post?
Old 11-10-2009, 06:33 AM
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I just bought it wensday 11/4/09, the problems I'm sorting are the p.o.'s
Old 11-10-2009, 08:44 AM
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I had a mouse take-up residence in my trunk who ate through the protective sheath of a 1.5" wire bundle. WIth your meter dropping to zero concurrent with the reverse circuit being activated, a wire diagram would help you look for areas where the two circuits are adjacent to each other. Might want to also begin looking around for evidence of vermin "residents", i.e. droppings, chewed-up carpet to make a bed, etc.

Hope you find the problem.

Chip, Woodbridge, VA
Old 11-11-2009, 07:45 AM
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Thanks all , JJ sc911 , special thanks,the thread you sent me was what I needed.Someone switched the wires ,that caused the whole problem!Nothing worse than trying to trouble shoot something thing that someone else FORKED UP! MANY THANKS!!!!!!!!!!!!!!!!
Old 11-12-2009, 04:45 PM
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Porsche Crest Great

One down, many more to solve...

A La Prochaine

J.J.
Old 11-12-2009, 05:08 PM
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