MGB & GT Forum
White / black wire question
Posted by wicklowwanderer
wicklowwanderer
David Steverson
Marietta, GA, USA
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Apr 30, 2017 03:08 PM
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1973 MGB - new wiiring harness
Short stub of a heavier gauge white / black wire coming out of the main harness in the engine bay corner, I cannot figure out what attaches to it. I know that color combo is tach/coil, but am lost on this one connection. Any help would be greatly appreciated.
David
Edited 2 time(s). Last edit at 2017-04-30 04:03 PM by wicklowwanderer.
Short stub of a heavier gauge white / black wire coming out of the main harness in the engine bay corner, I cannot figure out what attaches to it. I know that color combo is tach/coil, but am lost on this one connection. Any help would be greatly appreciated.
David
Edited 2 time(s). Last edit at 2017-04-30 04:03 PM by wicklowwanderer.
dickmoritz
Dick Moritz
Philly 'burbs, PA, USA
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Apr 30, 2017 03:14 PM
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Apr 30, 2017 06:05 PM
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Bring up this MGB electrical data:
http://www.advanceautowire.com/mgb.pdf
1973 harness is on Sheets 14,15, 16 and 17.
"Yes this year model took a bit of checking to decide what configuration they wanted."
Roger N. Tanner
Professional Engineer, Retired
Edited 1 time(s). Last edit at 2017-04-30 06:06 PM by rntanner.
http://www.advanceautowire.com/mgb.pdf
1973 harness is on Sheets 14,15, 16 and 17.
"Yes this year model took a bit of checking to decide what configuration they wanted."
Roger N. Tanner
Professional Engineer, Retired
Edited 1 time(s). Last edit at 2017-04-30 06:06 PM by rntanner.
Apr 30, 2017 06:09 PM
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He is talking about this wire that terminates right near the radiator panel to the far left in this photo
I intended to place a thread asking about it and the other wires you can see that come out there together in a mini spur of the wiring harness in the photo.
Michael J. Caputo
'79, '77, '76, '74.5 (rubber dual SU), and '73 owner. Extensive experience in 12v Audio System design and installation. Vendor of Regalia and Promotional Products since 1993. Supplier of Accessories to MOSS. Forum Member since 2009; with a warped sense of humor since birth. Publisher of the annual MGB & GT Calendar, mailed worldwide.
I intended to place a thread asking about it and the other wires you can see that come out there together in a mini spur of the wiring harness in the photo.
Michael J. Caputo
'79, '77, '76, '74.5 (rubber dual SU), and '73 owner. Extensive experience in 12v Audio System design and installation. Vendor of Regalia and Promotional Products since 1993. Supplier of Accessories to MOSS. Forum Member since 2009; with a warped sense of humor since birth. Publisher of the annual MGB & GT Calendar, mailed worldwide.
Member Services:
Please send photos for next year's calendar to photos25@mgbcalendar.com. If you need help with your Weber downdraft carburetor, feel free to call me at 978-249-5760, USA, Central Time!
wicklowwanderer
David Steverson
Marietta, GA, USA
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Apr 30, 2017 06:56 PM
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A magnifying glass and the Bentley wiring diagram showed white black for a GT rear window defroster, sure enough I found the other end at the console using my multi-meter . So it's a dead circuit on a roadster, or I could use it for somethign else.
Apr 30, 2017 08:02 PM
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My multimeter says it is continuous with the white/black tach wire.
Michael J. Caputo
'79, '77, '76, '74.5 (rubber dual SU), and '73 owner. Extensive experience in 12v Audio System design and installation. Vendor of Regalia and Promotional Products since 1993. Supplier of Accessories to MOSS. Forum Member since 2009; with a warped sense of humor since birth. Publisher of the annual MGB & GT Calendar, mailed worldwide.
Michael J. Caputo
'79, '77, '76, '74.5 (rubber dual SU), and '73 owner. Extensive experience in 12v Audio System design and installation. Vendor of Regalia and Promotional Products since 1993. Supplier of Accessories to MOSS. Forum Member since 2009; with a warped sense of humor since birth. Publisher of the annual MGB & GT Calendar, mailed worldwide.
Member Services:
Please send photos for next year's calendar to photos25@mgbcalendar.com. If you need help with your Weber downdraft carburetor, feel free to call me at 978-249-5760, USA, Central Time!
Apr 30, 2017 08:12 PM
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David, if it is right by the jumble of snap connectors it's the wire that feeds the rear window heater on the GT. The main harnesses for the roadster and GT are the same, that wire is in the 73 harness. It goes from the engine room into the console where it would be fed from a switch for the rear window heater. The rear harness, that runs from the jumble of snaps to the back of the car, has the mate to that wire.
In reply to # 3500991 by wicklowwanderer
1973 MGB - new wiiring harness
Short stub of a heavier gauge white / black wire coming out of the main harness in the engine bay corner, I cannot figure out what attaches to it. I know that color combo is tach/coil, but am lost on this one connection. Any help would be greatly appreciated.
David
Short stub of a heavier gauge white / black wire coming out of the main harness in the engine bay corner, I cannot figure out what attaches to it. I know that color combo is tach/coil, but am lost on this one connection. Any help would be greatly appreciated.
David
wicklowwanderer
David Steverson
Marietta, GA, USA
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May 1, 2017 06:57 AM
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