Can someone answer this?
04-30-2013, 11:35 PM
#1
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Can someone answer this?
I'll make it brief, I was asked this on another, non Porsche forum and couldn't find anything through search. I was thinking someone on here would know more than I on this topic.
The question:
Hey, do you know how the factory alarm works? Specifically, what sets it off, and what does it interrupt? It's an '84.
I figured out the #1 major problem with the thing running like crap: It had fuel injectors in it that were totally wrong. The owner doesn't know when they were put in, it's been to numerous shops that "knew what they were doing". Heh. This has snowballed into "fix everything important, the car is getting pressed into daily driver service". This means that my dehumidifier is in the car right now, and I'm confronted with a bunch of hideous, hacked, corroded wiring, and an alarm system with an electrolytic capacitor that fried, burning traces off of the circuit board.
I suspect that the blue wire off of the alternator is related ( I'm going by a Haynes manual), and I think it's showing that the blue wire provides tach signal. The car won't run for more than a few seconds with the blue wire attached, runs great with it off. Plus, the tach works and the alt charges with the blue wire off. My first reaction is to simply tape up the blue wire, but there is some other dumb electrical stuff going on, and I need to sort a lot of that out first.
Thanks in advance guys!
The question:
Hey, do you know how the factory alarm works? Specifically, what sets it off, and what does it interrupt? It's an '84.
I figured out the #1 major problem with the thing running like crap: It had fuel injectors in it that were totally wrong. The owner doesn't know when they were put in, it's been to numerous shops that "knew what they were doing". Heh. This has snowballed into "fix everything important, the car is getting pressed into daily driver service". This means that my dehumidifier is in the car right now, and I'm confronted with a bunch of hideous, hacked, corroded wiring, and an alarm system with an electrolytic capacitor that fried, burning traces off of the circuit board.
I suspect that the blue wire off of the alternator is related ( I'm going by a Haynes manual), and I think it's showing that the blue wire provides tach signal. The car won't run for more than a few seconds with the blue wire attached, runs great with it off. Plus, the tach works and the alt charges with the blue wire off. My first reaction is to simply tape up the blue wire, but there is some other dumb electrical stuff going on, and I need to sort a lot of that out first.
Thanks in advance guys!
04-30-2013, 11:50 PM
#3
Rennlist Member
I don't know all the answers, but the blue wire is your alternator field wire, and should be connected to the idiot light on the dash. It is 12 volts through this wire that "excites" the alternator field and makes it start charging.
Also, the tach feed comes from the DME.
The factory alarm is triggered by the door switches and there is a switch under the hood and one on the hatch shock, too. I don't remember off hand how the alarm prevents the engine from starting...
Also, the tach feed comes from the DME.
The factory alarm is triggered by the door switches and there is a switch under the hood and one on the hatch shock, too. I don't remember off hand how the alarm prevents the engine from starting...
05-01-2013, 02:45 AM
#7
Three Wheelin'
