Starting a 73-79 Wiring Tech Thread
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Logistics Pro
Joined: Aug 2003
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My advice would be to get a junkyard harness out of a 79 and go through it, then swap it in. It is far easier than trying to fix stuff under the dash of the truck.
Junior User
Joined: May 2013
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From: Fort Worth
Wiring question - 78 Ranger 400m c6 2wd
Can anyone help me identify what these should be connected to? In the second photo I am referring to the disconnect grey connector.
http://www.flickr.com/photos/104645638@N06/10151745114/http://www.flickr.com/photos/104645638@N06/10151974633/
http://www.flickr.com/photos/104645638@N06/10151745114/http://www.flickr.com/photos/104645638@N06/10151974633/
Last edited by lazzarruss; Oct 8, 2013 at 03:06 AM. Reason: updated links
Junior User
Joined: May 2013
Posts: 69
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From: Fort Worth
on the top picture the disconnected grey connector has three wires:
red with yellow strip
red with black strip
black
the wire on the bottom that has the 90 degree snap-on connector that is loose appears to be black bur has a red-ish tint?
I tried wiping the wire off but it be a red wire thats been burnt or in may just be an old worn black cable. I know that probably does not help.
I think its black.
red with yellow strip
red with black strip
black
the wire on the bottom that has the 90 degree snap-on connector that is loose appears to be black bur has a red-ish tint?
I tried wiping the wire off but it be a red wire thats been burnt or in may just be an old worn black cable. I know that probably does not help.
I think its black.
Hotshot
Joined: Apr 2009
Posts: 14,333
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From: Stanley, VA
The wire on the bottom, the one thats a 90 degree is either the wire for the temp sender or the oil pressure sender. Clean it off, if the wire is white w/ red stripe its for oil pressure, red w/white stripe it for the coolant temp.
I'll look and see if I can tell what that other plug is for, I'll let you know.
I'll look and see if I can tell what that other plug is for, I'll let you know.
Junior User
Joined: May 2013
Posts: 69
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From: Fort Worth
The wire on the bottom, the one thats a 90 degree is either the wire for the temp sender or the oil pressure sender. Clean it off, if the wire is white w/ red stripe its for oil pressure, red w/white stripe it for the coolant temp.
I'll look and see if I can tell what that other plug is for, I'll let you know.
I'll look and see if I can tell what that other plug is for, I'll let you know.
where does the oil pressure sensor wire go? I do not see any connectors sticking out. Ive looked around the oil pump and filter. but the wire is too short to run that far.
Junior User
Joined: May 2013
Posts: 69
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From: Fort Worth
WOW that wire was really dirty... It would not wipe clean with my fingers. But some some carb cleaner cleaned it enough that I could see it better....It is red.
where does the oil pressure sensor wire go? I do not see any connectors sticking out. Ive looked around the oil pump and filter. but the wire is too short to run that far.
where does the oil pressure sensor wire go? I do not see any connectors sticking out. Ive looked around the oil pump and filter. but the wire is too short to run that far.
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Hotshot
Joined: Apr 2009
Posts: 14,333
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From: Stanley, VA
That's the oil pressure sending unit. The one pictured is for trucks that have an oil pressure gauge. If you have an oil pressure warning light it takes a different, smaller sending unit.
Junior User
Joined: Sep 2013
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From: Portland, OR
mikeo0o0o0 said: Clean it off, if the wire is white w/ red stripe its for oil pressure, red w/white stripe it for the coolant temp
lazzarruss Said: But some some carb cleaner cleaned it enough that I could see it better....It is red.
I'm thinking Laz was saying red, as in with the white stripe, and the location of the plug (picture is sideways judging by the dizzy under your finger tips and the top rad hose that you hand is against) that would be for coolant temp guage.
Is that an aftermarket temp guage in the truck under the dash left of the steering? In the other picture it looks like there is an armored mechanical temp guage tube running in the firewall hole with the plug pushed in, the one to the left of the main harness plug. My guess would be someone disconnected the factory temp guage and put in an aftermarket one. Does the dash guage work?
lazzarruss Said: But some some carb cleaner cleaned it enough that I could see it better....It is red.
I'm thinking Laz was saying red, as in with the white stripe, and the location of the plug (picture is sideways judging by the dizzy under your finger tips and the top rad hose that you hand is against) that would be for coolant temp guage.
Is that an aftermarket temp guage in the truck under the dash left of the steering? In the other picture it looks like there is an armored mechanical temp guage tube running in the firewall hole with the plug pushed in, the one to the left of the main harness plug. My guess would be someone disconnected the factory temp guage and put in an aftermarket one. Does the dash guage work?
Logistics Pro
Joined: May 2003
Posts: 4,238
Likes: 21
From: Northern Illinois
Can anyone help me identify what these should be connected to? In the second photo I am referring to the disconnect grey connector.
IMG_20130527_190804_604 | Flickr - Photo Sharing!
IMG_20130604_114612_504 | Flickr - Photo Sharing!
IMG_20130527_190804_604 | Flickr - Photo Sharing!
IMG_20130604_114612_504 | Flickr - Photo Sharing!
The one in your bottom picture with the 90 is for the water sender located on the left side of the front of the motor as your looking at the motor.
The oil pressure sending unit on a 78 400 is located on the top center backside of the block behind the intake.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
. When the OP posted about the "hollow bolt" I got sidetracked (a symptom of age?). But you're correct, the wire he's holding is probably for the temp sender because he described it as red. If it was for oil pressure the OP probably would have said it was white.