Random electrical connectors
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Identify 'em yourself! Some of that appears for be for ignition... but here, you can trace the wire colors and teach yourself about your truck.:
<A HREF=http://i55.tinypic.com/21jw50l.jpg>74-78 Wiring Diagram Pt1</A>
<A HREF=http://i52.tinypic.com/35luc8n.jpg>74-78 Wiring Diagram Pt2</A>
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Which one has ya flummoxed? Post up the wire colors - main color and the trace color. For example, orange with a yellow trace would be "O/Y" or "O/y"
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
The connectors in your last picture appear to be for the ignition module. A three-terminal connector instead of a two-terminal connector for module power would point to a Duraspark I module instead of Duraspark II; I'm not sure which would be expected for a '76.
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New User
Joined: Dec 2012
Posts: 24
Likes: 0
From: Goose Creek, SC
The 4 terminal connector is for the blower and heater. Which explains why I have no heat lol.
The 3 terminal not used that I can't figure out has 3 wires:
Orange/Red
Black
Red
The 3 terminal not used that I can't figure out has 3 wires:
Orange/Red
Black
Red
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MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
That 4-terminal connector in your last picture is for the ignition module, I can guarantee you that. Three of the four wires in that connector go to the distributor; the fourth goes to the negative terminal of the coil. They do not touch the heater in any way.
I cannot explain the colors for the 3-terminal connector. The 1976 factory diagram claims you should just have RED with a BLUE stripe wire (hot-in-START) and BLUE (hot-in-RUN). The only thing I can think of is it's actually a late-model 1975 harness, which would have 3 wires running to this connector. However, I don't have access to the 1975 factory diagram.
I cannot explain the colors for the 3-terminal connector. The 1976 factory diagram claims you should just have RED with a BLUE stripe wire (hot-in-START) and BLUE (hot-in-RUN). The only thing I can think of is it's actually a late-model 1975 harness, which would have 3 wires running to this connector. However, I don't have access to the 1975 factory diagram.
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