Ghost in the machine - No radio, no lights, no dome light, no emergency flasher

[Donster]

It's getting weird now.
Last week the radio would cut off if I tapped the brakes - then the symptom disappeared.
Now, the engine will start - but - No lights, except turn signals, no radio, no dome light, no running lights, no emergency flashers
Checked all fuses. Could this be a relay? Is there a relay that controls all above mentioned?

?

Did I mention ?

Help!

[TopNotch]

Have you checked your fusible links?

[Donster]

Link B is good

[Fierofool]

Here's a link where you can download the 84 Factory Service Manual.  While you're there, download the 86 manual.  It pretty much covers all years even though it's for an 86.

http://www.fieronews.net/fusion/downloads.php

[Donster]

Thanks Charlie, but I already downloaded them ALL a while back.
And I noticed that only the 84 FSM has the correct layout for the fusible links. Haynes lists the fusible links as connected to the battery junction box, which was not used until 85 and later

Found my culprit: One of the BOSCH relays on the left side of the firewall - $ 4.59 @ O'Reilly's

She's illuminated with sound again 

Thanks all

\D

[Donster]

new symptom - no fuel to the TBI, pump is running
The electrical gremlin is crawling everywhere in this car it seems

[Donster]

OK, shorted pin G on the ADLC - pump runs
When I turn on ignition, fuel pump relay clicks, but only once instead of twice and I don't hear the pump

Is that the symptom of a bad pump relay? Swapped it with the A/C relay, which is identical, but it doesn't even click - not using A/C so I have no way of confirming if it is good or not.

So my actual question: If I short pin G and the pump runs, but the relay doesn't get it to run while not hotwired - is it the pump or the relay??

??

\D

[Fierofool]

It would be the relay or the circuit between the relay and pump.  If it was the pump, it wouldn't run, whether hotwired or not. 

 If you cycle the ignition too quickly, the relay or pump won't activate because the fuel system is still up to the required pressure.  The pump only runs for .8 to 2 seconds or until the fuel system reaches required pressure, whichever comes first.

[Donster]

Just put in brand new relay - same result - it clicks once - don't hear the pump - no fuel to TBI

I always paused between turning on ignition/cranking - figured that one out 

[Fierofool]

I do, too so the system can pressurize and the car will start quicker.  What I meant was that if you cycle between the OFF-RUN-OFF-RUN too quickly, and there's no leakdown on the fuel system, the relay or pump won't activate.  Do you still get the same result when you leave the ignition off for 15-20 seconds before turning it back to RUN?  It could be that the harness between the relay and pump is disconnected.  Ashby wasn't able to help you when you talked? 

[Donster]

same result even with pause

Ashby and I haven't talked yet

\D

[Donster]

OK, jumped pin B (green) on the relay and hear the pump run
with ignition on I get power to the green wire on the injector (solid)
While cranking nothing on the orange wire

Does this sound like a bad circuit on the ECM, as obviously relay, fuses and pump are ok?

HELP!

Did I mention: HELP! ?

\D

[CowsPatoot]

From my wiring charts, the green wire should be on pin B.  Pin A would be the Tan/White wire and when given power would be the same result as jumping Pin G of the ADLC.  I will assume you named the pin wrong and we are actually referring to the green wire.

The green wire is the input from the ECU.  It connects to pin 18 of the red/white connector.  If it works when putting 12v to the green wire, then it is either a broken wire to the ECU or it is the ECU.  I would first check voltage on pin 18 and see if you get anything (key on, of course), that should tell us if the ECU is good or not.

Is this an auto or a manual?  If it is a manual, I have an 84 manual ECU that worked last time I drove the car (though it has been a few years) that I could drop in the mail to you.

[Donster]

4 speed manual
Yes, I was referring to the green wire, which when +12V applied, fires up the pump

You say: "It connects to pin 18 of the red/white connector."
You also say: "I would first check voltage on pin 18 and see if you get anything (key on, of course), that should tell us if the ECU is good or not." Again
Where do I find pin 18?

If it is the ECU and you get yours to me, you just became my best friend 

Kidding asside, if I know where pin 18 is, I'll test it and let you know

\D

[Donster]

Correction:

The pump fires up when applying +12V to the TAN/WHITE on the FP Relay connector
+12V to Green does nothing - my mistake

Does this give anybody another idea or should I still assume it's the ECM or at least the connection between the FP Relay connector and the ECM?

Anyone?

\D