what this plug for? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Pontiac1976 · 07-16-2018, 11:36 AM

I had this loose in the bay since I changed the wiring. I never come across it when looking so far.

Not sure if this one of the optional wires for the 700R4 hook up.

Because I have factory dual set up on this wiring harness both Dist. 4 pin & 5, & the 700R4 trans.

1984 GMC 305 700R4 1/2Ton

Where does this go to?.

Justins76 · 07-16-2018, 12:25 PM

EGR solenoid?

Pontiac1976 · 07-16-2018, 07:55 PM

The EGR is vacuum operated. I do not think there was a solenoid on it that I know.
where was the solenoid located ?

95 S_Trucker · 07-17-2018, 06:04 AM

Quote:

Originally Posted by Pontiac1976

The EGR is vacuum operated. I do not think there was a solenoid on it that I know.
where was the solenoid located ?

An 84 305 came with an EGR solenoid from the factory. It would help control vacuum going to the EGR valve. It was located to the right side(passenger side) of the distributor.

**hatzie** · 07-17-2018, 07:23 AM

EGR solenoid has different color wires and a different connector.

Harness came from a Manual transmission truck?

The ESC 1st gear switch on a 1984 manual transmission truck has a two-terminal Weatherpak with Green and Yellow wires. Yellow goes back to the ignition Crank wire just before the Clutch interlock and Green goes to the ESC computer.

Pontiac1976 · 07-17-2018, 11:19 PM

hatzie Qoute:EGR solenoid has different color wires and a different connector.

Harness came from a Manual transmission truck?

The ESC 1st gear switch on a 1984 manual transmission truck has a two-terminal Weatherpak with Green and Yellow wires. Yellow goes back to the ignition Crank wire just before the Clutch interlock and Green goes to the ESC computer.

Answer: The Truck is a 84 GMC 305 Auto, None A/c Truck had duel set up Dist. set ups 84 had a TH350 in it no motor. I got the cab, clip witch the clip is mostly on my 77
and the wiring harness still has the computer. I have not seen the connector before yet. I not sure if it's a Factory Plug. Wire green & yellow look's like 14ga

Pontiac1976 · 07-21-2018, 06:59 AM

I wonder if the truck had dual wiring Trans set up too, since it had dual Dist. wiring set up too. That would explain why most 84 trucks when I was looking for it was on A/T
not a lot truck had this set up.

**hatzie** · 07-22-2018, 07:36 PM

Download the 1984 wiring diagrams. Not very many Weatherpak plugs in that year harness period.

Get your meter out and set it up as a continuity buzzer.
Does the yellow wire ring out the neutral safety switch?
Does the green wire ring out to the ESC computer?

Pontiac1976 · 08-22-2018, 11:23 PM

Quote:

Quote: hatzie Harness came from a Manual transmission truck?

The ESC 1st gear switch on a 1984 manual transmission truck has a two-terminal Weatherpak with Green and Yellow wires. Yellow goes back to the ignition Crank wire just before the Clutch interlock and Green goes to the ESC computer.

Good call had time test start taking it out. And it turn out that it is set up for Dual trans wiring for A/T and M/T backup light. 700R4 wiring, Dual Dist. wiring. I'm really happy I grabbed this wiring harness did the 84 change over.

07-16-2018, 11:36 AM	#1
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 766	what this plug for? I had this loose in the bay since I changed the wiring. I never come across it when looking so far. Not sure if this one of the optional wires for the 700R4 hook up. Because I have factory dual set up on this wiring harness both Dist. 4 pin & 5, & the 700R4 trans. 1984 GMC 305 700R4 1/2Ton Where does this go to?. __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.

07-16-2018, 12:25 PM	#2
Justins76 OutOfMyMind & I'llNeverKnowWhy Join Date: Apr 2004 Location: Another world, some other time Posts: 672	Re: what this plug for? EGR solenoid? __________________ -Justin-Out of my mind and I'll never know why 1976 Chevrolet Silverado C10 350 4bbl / TH350 Big10 longbed 1986 Pontiac Firebird T-Top 5.0L TPI 700R4 WS6 1992 Pontiac Firebird T-Top 5.0L TBI 700R4 My cardomain page I don't like to save, it's more fun to spend!!

07-16-2018, 07:55 PM	#3
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 766	Re: what this plug for? The EGR is vacuum operated. I do not think there was a solenoid on it that I know. where was the solenoid located ? __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.

07-17-2018, 07:23 AM	#5
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: what this plug for? EGR solenoid has different color wires and a different connector. Harness came from a Manual transmission truck? The ESC 1st gear switch on a 1984 manual transmission truck has a two-terminal Weatherpak with Green and Yellow wires. Yellow goes back to the ignition Crank wire just before the Clutch interlock and Green goes to the ESC computer. __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 07-17-2018 at 07:28 AM.

07-17-2018, 11:19 PM	#6
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 766	Re: what this plug for? hatzie Qoute:EGR solenoid has different color wires and a different connector. Harness came from a Manual transmission truck? The ESC 1st gear switch on a 1984 manual transmission truck has a two-terminal Weatherpak with Green and Yellow wires. Yellow goes back to the ignition Crank wire just before the Clutch interlock and Green goes to the ESC computer. Answer: The Truck is a 84 GMC 305 Auto, None A/c Truck had duel set up Dist. set ups 84 had a TH350 in it no motor. I got the cab, clip witch the clip is mostly on my 77 and the wiring harness still has the computer. I have not seen the connector before yet. I not sure if it's a Factory Plug. Wire green & yellow look's like 14ga __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change. Last edited by Pontiac1976; 07-20-2018 at 12:38 AM.

07-21-2018, 06:59 AM	#7
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 766	Re: what this plug for? I wonder if the truck had dual wiring Trans set up too, since it had dual Dist. wiring set up too. That would explain why most 84 trucks when I was looking for it was on A/T not a lot truck had this set up. __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.

07-22-2018, 07:36 PM	#8
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: what this plug for? Download the 1984 wiring diagrams. Not very many Weatherpak plugs in that year harness period. Get your meter out and set it up as a continuity buzzer. Does the yellow wire ring out the neutral safety switch? Does the green wire ring out to the ESC computer? __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.



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