The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Some days i feel like i'm beating a dead horse

**hatzie** · 01-17-2018, 10:01 AM

Wiring diagrams, by year, are in my signature.

Here's my dual tank theory of operation writeup. My intention was to demystify the NL2 dual tanks electrical operation.
http://67-72chevytrucks.com/vboard/s....php?p=8152326

Grounds depend on the model.
ALL 73-86 CK and 87-91 RV diesel models have a tang on the sender ring that GM used to attach a short pigtail ground to the frame. The original pigtail is a black wire with a non-insulated ring terminal on the frame to Non-insulated Flag terminal on the sender ring tang.

The 87-91 TBI RV series have an in-tank fuel pump with Ground, Pump Power, and sender wires running through a strain relief in the top of the sender. The ground is a ring terminal and the remaining wires are run through a Weatherpak.

01-17-2018, 10:01 AM	#11
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 5,020	Re: Some days i feel like i'm beating a dead horse Wiring diagrams, by year, are in my signature. Here's my dual tank theory of operation writeup. My intention was to demystify the NL2 dual tanks electrical operation. http://67-72chevytrucks.com/vboard/s....php?p=8152326 Grounds depend on the model. ALL 73-86 CK and 87-91 RV diesel models have a tang on the sender ring that GM used to attach a short pigtail ground to the frame. The original pigtail is a black wire with a non-insulated ring terminal on the frame to Non-insulated Flag terminal on the sender ring tang. The 87-91 TBI RV series have an in-tank fuel pump with Ground, Pump Power, and sender wires running through a strain relief in the top of the sender. The ground is a ring terminal and the remaining wires are run through a Weatherpak. __________________ 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; 01-17-2018 at 10:08 AM.