| Main bulkhead connector [message #371454] |
Sun, 30 July 2023 09:16  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
|
Senior Member |
|
|
I just picked up a 78 Royale rear bath in survivor condition with only 42,000 miles. Goal is to get as close to day one condition. It’s unmolested except for 12V add-ons like fog lamps, dash mount fan, CB, PA horn, air horns and car phone install with big transceiver box and lots of really bad wiring and switches to all of these. I’ve removed a big ball of wiring, fuses, switches so far. The main loom under passenger hood has had some wires tagged on, some soldered and taped and some “twist and hope” with tape. I want to unplug the main connector, de-pin the bad wires so I can repair properly and add shrink. I have loosened the center bolt and thought the connector would unplug but seems like added clips or snaps are holding it. Also removed 2 long screws from glove box fuse panel hoping to remove that and bench service it. Loose but not coming out. Are there more screws? I can find the wiring diagram but not a pin out drawing of the bulkhead connector like in newer GM service manuals. Any info on this or what section of what manual in the CD sets to look for would be appreciated.
John Lebetski
Woodstock, IL
77 Eleganza II
|
|
|
|
| Re: Main bulkhead connector [message #371455 is a reply to message #371454] |
Mon, 31 July 2023 10:02  |
Bruce Hart
Messages: 1500
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
|
Senior Member |
|
|
John, the corners where the fasteners are there are two thin protrusions from the firewall side block that hooks onto the fuse block. Like most plastic electrical connectors there is a locking mechanism.
Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
|
|
|
|
| Re: Main bulkhead connector [message #371456 is a reply to message #371454] |
Mon, 31 July 2023 16:14 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
|
Senior Member |
|
|
Ok so work on releasing from the glove box side. I’ll get a bright light in there and look. Thanks.
John Lebetski
Woodstock, IL
77 Eleganza II
|
|
|
|
| Re: Main bulkhead connector [message #371457 is a reply to message #371454] |
Tue, 01 August 2023 07:49 |
Jp Benson
Messages: 649
Registered: October 2011
Location: Fla
Karma: 2
|
Senior Member |
|
|
There are two corner screws on the glove box side and one center screw on the outside. It all comes apart. I removed the entire wire harness, soaked the fuse block in mineral spirits for about a week to loosen the sealant that blocks airflow. Then cleaned it up, put it all back together and reused most of the wiring. Never did reseal the outside block. IIRC the connectors are Packard 55.
I never did find a fuse block diagram. The wiring diagrams in the back of the service manual contain the necessary info.
JP
[Updated on: Tue, 01 August 2023 07:56] Report message to a moderator |
|
|
|
| Re: Main bulkhead connector [message #371458 is a reply to message #371454] |
Tue, 01 August 2023 20:04 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
|
Senior Member |
|
|
I called Steve at Cinnabar and he confirmed it was just the factory anti ox tar holding it once center bolt removed. I have a mini pry-bar tool so went around and around and gently got it removed. I bent the pin slightly with my fingernail to grab block better, slipped shrink over end and repined. All fixed and PO bad 12V wiring all removed. .
John Lebetski
Woodstock, IL
77 Eleganza II
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
