70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

[Bill L.]

Does anyone have a picture showing how GM added the second wire from the hood switch to the wiper motor ground lug for the alarm?

I saved my old harness but that connector is long gone.

Thanks,


Bill

[Jeffrey S.]

Re: 70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

Does anyone have a picture showing how GM added the second wire from the hood switch to the wiper motor ground lug for the alarm?

I saved my old harness but that connector is long gone.

Thanks,


Bill

Bill,
Attached is a photo of the ground attachment at the wiper motot ground lug on my '69. I don't know for sure if it is the same on a '70 but it may help.
Jeff

[Bill L.]

Re: 70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

Thank you Jeff. I am thinking the connect os what I need. I replaced the harness since mine was so cut up and brittle. Apparently LL or whomever did not use the right connector.

Kind Regards,


Bill

[Richard K.]

Re: 70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

Bill, here is the connector on my late 70. Wire from connector to ground is not original. Hope it helps.

[Bill L.]

Re: 70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

Bill, here is the connector on my late 70. Wire from connector to ground is not original. Hope it helps.

Thank you Richard.


Kind Regards,


Bill

[Floyd B.]

Re: 70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

Since this is an old thread, I don't think I'm committing a foul by hijacking it...

I have one last task to complete the restoration of the alarm system in my '69. I purchased the special "piggy-back" connector that appears in Jeff's pic and I found the abandoned white wire behind the dash. However, I have no idea how these wires are routed to the switch under the hood. The hole for the switch only passes into the wiper cavity. The AIM does not provide detail on which hole the black ground wire (from the wiper ground) uses to pass through the firewall. Nor can I find information on how to route the white wire from the courtesy light / alarm circuit.

One other question. The diagrams I have all seem to indicate that the interior courtesy lights will illuminate when the hood is open. Is this really the case? Seems odd.

Thanx

-Floyd-

[Jeffrey S.]

Re: 70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

Floyd,
I will be in my shop later this morning and I will see if I can take a photo of the routing of the wires. The interior lights should not light when the hood is open. What's most likely happening is that the interior lights are grounding through the alarm system. I had a similar situation many years ago in that the wipers would only work with a door open. They were grounding through the alarm and I found that the proper ground at the starter was broken. It's been a long time but as I remember it the ground for the wiper goes through this same piggy back terminal and with the proper ground broken the only path to ground was the alarm door switches. Perhaps a similar situation with your interior lights?
Jeff

[Floyd B.]

Re: 70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

Thanx Jeff. I studied the schematics for both the courtesy lights and alarm (UA6) circuits. I now see that the white-wire ground circuits for these two features are completely separate. The only thing they share is the grounding point at the door jam switches. Unfortunately one of the previous owners fused every white wire he could find into a single knot behind the dash. I will have to separate all those wires into their proper circuits for the interior lights and alarm system.

I also studied the UA6 AIM sheets last night. It appears UA6-A2 has the white wire passing into the engine compartment via the vacuum hose grommet or the tach cable and reverse lights grommet - it seems that the tach cable grommet would make the most sense. On sheet UA6-A1 it then appears to join up with the black ground wire and pass back into wiper cavity and finally connects with the hood switch. Which hole it uses to pass into the wiper cavity is really unclear on the diagram. If you could take a look at yours and either confirm or correct my description of this routing, and identify the hole used to pass the wires into the wiper cavity, it would be a huge help.

Thanx again, my list of favors I owe you keeps growing.

[Jeffrey S.]

Re: 70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

Floyd, Attached is a photo of the firewall grommet that carries the black ground to the wiper. It is between the ignition shielding box and the wiper door actuator. Happy to help!

[Floyd B.]

Re: 70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

Thanx Jeff. Glad you posted this pic because it is not what I expected. I managed to correct all the other courtesy light and alarm wiring today so now all I have left to do is connect the hood switch wires to the switch. Unfortunately I also took a step backwards. My alarm horn bought the farm while I was testing the alarm circuit. I had to finish using a test light.

[Jeffrey S.]

Re: 70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

When you say it "...bought the farm..." do you mean it melted or just stopped working? Many times they can be brought back to life by turning the adjuster knob but getting at it is a job. If you detach the muffler hanger you might be able to reach up there and turn the knob.

[Floyd B.]

Re: 70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

I read the other horn repair thread you started. My car currently has side pipes (not original) so getting to the area behind the driver side rear wheel is very easy. Actually all three of my horns are not working and I already have them out of the car. I will take them apart this coming weekend and use the suggested methods in an attempt to get them working. Do you know the approximate note of the alarm horn? Should it sound like the low note, high note, or somewhere in between?

Thanx

[Jeffrey S.]

Re: 70 U69 Alarm Ground from Hood Switch to Wiper Motor Connection

Actually, it is a pathetic bleeping sound- like a bleating sheep. DON'T PUT 12 VOLTS ON IT FOR ANYTHING MORE THAN A FEW SECONDS AT A TIME!!! You will fry it.