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Electrical and Electronic

Interior electrical issues.

I just purchased my first Porsche. A 1987 911 Carrera Coupe. The passenger side window inoperable, a/c heat fan not blowing, but air comes from demisters, side mirrors not working. Is this a wiring issue or a fuse issue? Also any recomendations of companies to fix odometer as well as gas guage?




Cruise Control

Our cruise control works but the speed slowly drops.

Whats the fix?


Tach is intermitant.

Do I pry it out like clock or speedo?

Front directional signal light fixture

Replacing front directional signal fixtures, where do the wires from the light unit connect to the system ?

Power to fuel pumps


I have an 85 Euro 930. The power going to the fuse feeding the 2 fuel pump relays is switched. I see on-line pictures of 930 fuse blocks with the voltage to the fuse shunted from the adjacent fuse which is always hot (coming directly from the battery).

This makes more sense. Why would I want the current going to two fuel pumps to go through my ignition switch? Am I missing something?



where is the fuel pump relay located on a 1986 911?

i want to replace the fuel pump /  DME relay but i dont know where it is located.

left tail ight not working blows fuse immediately

Left rear tail light blows fuse immediately after light switch turned on, all bulbs ok, not sure where to start

Not a question but may be helpful. In issue 738 page 132 there's a question about a 1986 911: Quits running. My 1988 911 did the same. The problem was the 30 yr old security system. Heat cause expansion and shut down system.

Not a question but may be helpful. In issue 738 page 132 there's a question about a 1986 911: Quits running. My 1988 911 did the same when heated especially in summer. After spending a lot of money on sensors I took it to Eurasia Motors in Birmingham ( you once did an article on this place). Casey had seen this before on these models. It turned out the 30 year old plastic box security system had developed cracks inside. When heated they expanded and the system did what it's suppose to do, shut down the engine. When cooled everything went back to normal.

Battery issue

I recently acquired a 1986 911 Targa.  I'm using my Porsche battery maintainer (980-611-981-00) but experiencing battery drain after only 2-3 days from the last time a drove the car.  I spoke with the seller and they claim not experiencing this issue.  Since purchasing the car two months ago, I replaced the passenger power window switch - it was operable but the switch stuck when pushed in the down position.  I've checked the door switches and trunk light after turning the ignition off.  And the power windows will only work until opening the door - when the circuit appears to properly cut p


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