What are the warning lights in the Speedo on a '78 and up? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Gregski** · 12-31-2018, 01:40 PM

I lost my orange/red see-through plastic lens that goes behind the speedo on a 1978 gauge cluster and would like to remember what those two warning lights were for? On the Tach side I have a Fasten Belts light and a Brake warning light. I am building my own custom gauges and want to have the corresponding idiot lights for all those. Can you help?

**hatzie** · 12-31-2018, 02:21 PM

4WD-Lock and ???

Prong · 12-31-2018, 04:09 PM

Choke is the other one I believe.

**Gregski** · 12-31-2018, 08:25 PM

Thank you, I don't think I need either. And I knew as soon as I post this I would find that darn thing, and yup here it is.

wahl4m · 01-14-2019, 05:58 PM

the 2 wires from the transfer case -signal this 4wd lite ????? thanks for any info !

**hatzie** · 01-14-2019, 06:08 PM

Quote:

Originally Posted by wahl4m

the 2 wires from the transfer case -signal this 4wd lite ????? thanks for any info !

Look at the wiring diagrams. One leg of the 4WD lamp is direct from either circuit 39 or 150 in the instrument cluster plug...
I can't remember which off the top of my head. CRS

The switched leg, be it either the Hot or Ground, to the 4WD lamp runs through the transfer case switch. Again the wiring diagrams will tell everything you need to know.

wahl4m · 01-14-2019, 06:17 PM

im trying to get this 81 k-30 -with a 87 cab finished up-got several wire problems ! [SORRY ABOUT HIJACKING THIS MESSAGE }this 2 prong plug runs fron transfer case up through cab JUST CANT SEEM TO FIND ATTACHING PLUG &WIRES FROM DASH -NEED TO LOOK AGAIN?? ALSO SEEM TO HAVE HORN HONK -WHEN I CLICK WIPERS ON HIGH ?? WIRING PROBLEMS ARE
FUNNNNNN

**hatzie** · 01-14-2019, 06:21 PM

Quote:

Originally Posted by wahl4m

im trying to get this 81 k-30 -with a 87 cab finished up-got several wire problems ! [SORRY ABOUT HIJACKING THIS MESSAGE }this 2 prong plug runs fron transfer case up through cab JUST CANT SEEM TO FIND ATTACHING PLUG &WIRES FROM DASH -NEED TO LOOK AGAIN?? ALSO SEEM TO HAVE HORN HONK -WHEN I CLICK WIPERS ON HIGH ?? WIRING PROBLEMS ARE
FUNNNNNN

Check the dash grounds. They're right above the e-brake pedal.
Won't cure everything but it'll help a bunch.

**hatzie** · 01-14-2019, 06:12 PM

Quote:

Originally Posted by Gregski

Thank you, I don't think I need either. And I knew as soon as I post this I would find that darn thing, and yup here it is.

Later trucks had CHOKE lights that were married into the switched regulator wire on the alternator. 74 didn't originally have electric choke wiring... IIRC it only had a BRAKE lamp on the gauge clusters, in the bottom of the tach or the lower left gauge slot, and that was it.

12-31-2018, 01:40 PM	#1
Gregski Post Whore Join Date: Aug 2014 Location: Sacramento, CA Posts: 10,883	What are the warning lights in the Speedo on a '78 and up? I lost my orange/red see-through plastic lens that goes behind the speedo on a 1978 gauge cluster and would like to remember what those two warning lights were for? On the Tach side I have a Fasten Belts light and a Brake warning light. I am building my own custom gauges and want to have the corresponding idiot lights for all those. Can you help?

12-31-2018, 02:21 PM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 5,020	Re: What are the warning lights in the Speedo on a '78 and up? 4WD-Lock and ??? __________________ 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.

12-31-2018, 04:09 PM	#3
Prong Registered User Join Date: May 2007 Location: CO Posts: 476	Re: What are the warning lights in the Speedo on a '78 and up? Choke is the other one I believe.

12-31-2018, 08:25 PM	#4
Gregski Post Whore Join Date: Aug 2014 Location: Sacramento, CA Posts: 10,883	Re: What are the warning lights in the Speedo on a '78 and up? Thank you, I don't think I need either. And I knew as soon as I post this I would find that darn thing, and yup here it is. Attached Images Last edited by Gregski; 12-31-2018 at 10:02 PM.

01-14-2019, 05:58 PM	#5
wahl4m Registered User Join Date: Jan 2002 Location: norwalk,iowa,usa Posts: 920	Re: What are the warning lights in the Speedo on a '78 and up? the 2 wires from the transfer case -signal this 4wd lite ????? thanks for any info !

01-14-2019, 06:17 PM	#7
wahl4m Registered User Join Date: Jan 2002 Location: norwalk,iowa,usa Posts: 920	Re: What are the warning lights in the Speedo on a '78 and up? im trying to get this 81 k-30 -with a 87 cab finished up-got several wire problems ! [SORRY ABOUT HIJACKING THIS MESSAGE }this 2 prong plug runs fron transfer case up through cab JUST CANT SEEM TO FIND ATTACHING PLUG &WIRES FROM DASH -NEED TO LOOK AGAIN?? ALSO SEEM TO HAVE HORN HONK -WHEN I CLICK WIPERS ON HIGH ?? WIRING PROBLEMS ARE FUNNNNNN



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