2 Volts at WUR - Battery Dies???

[jason2guy]

i was checking for voltage at the AAR, i had the FP relay wired on, it read 12+vlts i wiggled the connector and the voltage went away and all sorts of problems started. the battery dies on the drive right after the work. i charge the battery and it starts. at home the voltage at the WUR and AAR is 2+vlts. then i see smoke from the fuse panel. can the shorted out wire going to the AAR cause all this? voltage at the battery is 12.5 running

[timmy2]

Yes, a dead short in your engine harness wiring will cause all sorts of problems.
Where was it smoking ? Front or Rear fuse panel?
Take some pictures of where you have suspect wiring.
Running battery voltage seems low. Charge the battery on a charger overnight and see what it goes up to on the bench and then in the car running at 2000 rpm. Should be 13.5-13.8 volts.

[Bob Kontak]

Originally Posted by jason2guy

i wiggled the connector and the voltage went away and all sorts of problems started.

What connector did you wiggle? You mention the AAR and the fuel pump relay in the same sentence. Not sure what the subject is. Does that make sense?

Why are you doing this?

Context helps. Context means that you paint a picture with words that helps the reader grasp what and why you are attempting to do something.

[jason2guy]

ok. high idle from cold start. i checked for voltage at the AAR w/the FP relay jumprd.
i saw 12+vlts, then i wiggled the AAR connector and watched the voltage disappear.
then i checkd the WUR voltage, none there. i left both unplugged and went for a ride, i stopped and when i tried to restart 5 min later the battery was dead. came back the next morning w/a charger, charged it up and it started. drove home and started chking again. chked voltage at the battery running and it was 12.5 vlts thats when i saw smoke from the front fuse box. pin 10 on the engine harness shows .05 ohms to ground. is that right?
pin 10 shouldnt be grounded right? and thank you

[boyt911sc]

Originally Posted by jason2guy

ok. high idle from cold start. i checked for voltage at the AAR w/the FP relay jumprd.
i saw 12+vlts, then i wiggled the AAR connector and watched the voltage disappear.
then i checkd the WUR voltage, none there. i left both unplugged and went for a ride, i stopped and when i tried to restart 5 min later the battery was dead. came back the next morning w/a charger, charged it up and it started. drove home and started chking again. chked voltage at the battery running and it was 12.5 vlts thats when i saw smoke from the front fuse box. pin 10 on the engine harness shows .05 ohms to ground. is that right?
pin 10 shouldnt be grounded right? and thank you

Jason,

Pin #10 (14-pin connector) is connected to the FP relay @ terminal #30 that supplies power to WUR, AAR, and TTV (optional). Thus the continuity you see at pin #10 is the ground connection for the load (resistance).

Tony

[timmy2]

No, Pin 10 shouldn't be grounded but it is a path to ground through the coils on the devices it feeds.
With the 14 pin connector disconnected:
If you remove the WUR and AAR connectors and ensure the taped off connector that is left over in the harness from the '78/'79 Vacuum control switch is in tact, you should not see a path to ground if the wiring is ok.
Then check the AAR and WUR device connection posts to ground and for resistance between each other on each ones coil. Should be about 25+ ohms on the WUR and 35 ohms on the AAR give or take a few depending on the year.
Any signs of heating in the front fuse panel?

[jason2guy]

i think thats the problem. from the 10pin to the connectors there is a short. so the fix is to make up a harness to go from pin10 to the WUR and AAR, right?

[timmy2]

I hope this makes sense:
The red and white wire in your engine harness goes from pin 10 of the 14 pin connector to one of the pins in the timer Jr. connector for the AAR, and then doubles back to the WUR.
(Double wire on the AAR pin)

The ground wire on the circuit goes from the alternator ground connection on the alternator to the other AAR Timer Jr. pin and then to the WUR. (Double wire on the AAR pin)

[jason2guy]

these are my AAR and WUR harnesessss. i made up a temp harness just to see if thats the fix. i live in an apt so ill have to start up tmro

[timmy2]

Wow!
Looks like you found your problem!
I hope nothing else in your harness is like that.

Some inspiration for you.

Here's a picture of a new harness I was building today , the top one is a model I use for the pattern. New one is on the bottom before wrapping and terminating.
It is for an external regulator car, so there are a few small differences from yours.
(4 wires and one 2 connectors less)



Ready for terminals and finishing:

[thumbdoctor]

Great stuff Dennis. When it comes to short circuits, I find disconnecting the harness from the closest large connector and checking continuity of each wire termination then ground eliminates a lot of potential guess work. Trying to energize problem circuits with the battery (charger) creates smoke and damages parallel circuits.

Originally Posted by timmy2

Wow!
Looks like you found your problem!
I hope nothing else in your harness is like that.

Some inspiration for you.

Here's a picture of a new harness I was building today , the top one is a model I use for the pattern. New one is on the bottom before wrapping and terminating.
It is for an external regulator car, so there are a few small differences from yours.
(4 wires and one 2 connectors less)



Ready for terminals and finishing:

[jason2guy]

problem solved. i made a temp harness w/the old connectors and its back to normal.