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04-02-2016, 02:43 PM
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#1 |
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Registered User
Join Date: May 2010
Location: Shoals, AL
Posts: 299
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Guess that part!
Better yet tell me what it is...
Also, where does the black connector go? |
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04-02-2016, 02:44 PM
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#2 |
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Registered User
Join Date: May 2010
Location: Shoals, AL
Posts: 299
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Re: Guess that part!
What is it?
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04-02-2016, 04:59 PM
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#3 |
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Registered User
Join Date: Aug 2005
Location: Louisiana
Posts: 711
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Re: Guess that part!
That 4 prong plug looks the one that goes down to the drivers side of the transmission for torque converter lockup.
The black plug looks like an oil pressure sensor connector. |
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04-03-2016, 12:10 PM
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#4 |
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Registered User
Join Date: May 2010
Location: Shoals, AL
Posts: 299
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Re: Guess that part!
Yes. First pic is for trans harness. The white does go to the trans, the red is a "test" connector. The black I don't believe goes to oil sender. I think the oil sender connector is a single prong.
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04-03-2016, 12:12 PM
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#5 |
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Registered User
Join Date: May 2010
Location: Shoals, AL
Posts: 299
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Re: Guess that part!
I still would like to know what the vac switch on the firewall is for. There is another that I'm doing away with that is part of the ESC system.
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04-03-2016, 12:20 PM
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#6 |
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Registered User
Join Date: Jul 2011
Location: SW Ontario
Posts: 1,212
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Re: Guess that part!
The black [round connector] looks like the oil pressure SWITCH that is on the block (drivers side)-not to be confused with the oil pressure sender/switch for the guages/idiot light. Used for the power feed to the electric choke, no oil pressure, choke won't get 12v, once oil pressure achieved, switch closes sending 12volt to the choke, it is also what triggers the CHOKE light.
The bottom vacuum device is for the transmission, overdrive, forget what it exactly does, might be over drive override, or overdrive cancel. If you got a factory wiring diagram with the separate transmission callouts, you'll locate it quickly. Alex. |
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04-03-2016, 05:47 PM
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#7 |
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Senior Member
 
Join Date: Jun 2009
Location: Phoenix AZ
Posts: 4,602
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Re: Guess that part!
To me the black plug looks like it goes to the low pressure switch for the A/C
__________________
AZPartsLocators on Instagram 1972 Cheyenne Super Short Bed big block "Blackie" 1977 Crew Cab GMC Short bed with 4BT Intercooled Cummins Diesel and a 4L80e "The Junkyard Dog" 1985 Crew Cab Chevy dually with 5.9 Cummins "The Big Dog" This is what my dad liked to be called by the grandkids before he passed so it seems fitting for his old truck. |
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04-03-2016, 05:51 PM
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#8 | |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,977
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Re: Guess that part!
Quote:
The white 4 position square Weatherpack is usually an early TH700R4 or TH350C lockup control harness connector. A few WAGS on the black plug... Not knowing the (*&#%$^( model year makes these more than a challenge. If the wires in and out of the round black plug are GREEN then it's the LPCO for AC. If they are BLUE then it's the Oil pressure switch just above the oil filter for the CHOKE. The ESC system uses a round black plug to the Knock Sensor on the oil pan rail next to the LH motor mount. It's kind of a (*&^%() to figure out what these are when we don't know what year the truck is... Just put it in your signature if you don't like typing it over and over.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. Last edited by hatzie; 04-03-2016 at 06:01 PM. |
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04-03-2016, 07:08 PM
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#9 |
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Registered User
Join Date: May 2010
Location: Shoals, AL
Posts: 299
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Re: Guess that part!
Sorry! It's a 1986 w/ TH350C. I believe the oil press switch is correct. The vac switch on the firewall hasn't ever had a vac hose connected. Would that be fed from full man. or ported? Do I even need it?
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04-05-2016, 12:29 AM
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#10 | |
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Gentleman Jim Driver
Join Date: Nov 2002
Location: Poulsbo, WA
Posts: 1,553
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Re: Guess that part!
Quote:
__________________
Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed |
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