1978 K30 Gauge issues-HELP HELP HELP - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**ddc456** · 10-31-2018, 07:20 PM

I'm at a loss on where to look. none of the gauges or lights in the dash are working. It's only when i lift the turn signal to the right that both turn signal indicators and the blue light indicators for the hi beams start flashing like my hazard are on.......
The ground off of the wiring harness inside the cab is connected to the BUSS Ground connector...like i said, i don't know where to look next.

Anyone been in the same situation? what or where should i try next?

Thanks

**Palf70Step** · 11-01-2018, 08:00 AM

What is the condition of you circuit board on the backside of you gauge cluster? Mine is messed up and seems to be causing a similar short there. I am in the process of replacing that circuit board now.

**ddc456** · 11-01-2018, 10:50 AM

Quote:

Originally Posted by Palf70Step

What is the condition of you circuit board on the backside of you gauge cluster? Mine is messed up and seems to be causing a similar short there. I am in the process of replacing that circuit board now.

well see i've tried 4 different gauge packs, and all with similar results, but that is going to be my next try.

**hatzie** · 11-01-2018, 11:04 AM

Are all of the black ground wires solidly connected back to the buss bar?

The Ground and power wires have splices in the harness about 6-8" from the cluster plug. These can loosen up.

Printed circuit issues would cause this as well.
Do your gauges work?

**ddc456** · 11-01-2018, 11:29 AM

Quote:

Originally Posted by hatzie

Are all of the black ground wires solidly connected back to the buss bar?

The Ground and power wires have splices in the harness about 6-8" from the cluster plug. These can loosen up.

Printed circuit issues would cause this as well.
Do your gauges work?

ground is good to the Buss Bar, gauges do not work. when i roll the head light switch like i'm going to turn the dome light on, the gauges (oil pressure, volts/amp) start swing every which direction, but the background lights to the gauges kind of work (off and on)

**hatzie** · 11-01-2018, 02:17 PM

That sounds like a bad ground.

andyh1956 · 11-01-2018, 04:42 PM

My S10 did this XACT same thing! Ground strip that grounded the gauge pod at the pod plug was open.

**ddc456** · 11-05-2018, 03:00 PM

Bad ground at the Buss Bar was the problem. Now i just need to figure why the fuel gauge isn't working. Stuck on "E" even switching tanks....

**hatzie** · 11-05-2018, 03:07 PM

A dead shorted sender wire between the valve and the cluster plug would do that.

**ddc456** · 11-05-2018, 06:14 PM

Quote:

Originally Posted by hatzie

A dead shorted sender wire between the valve and the cluster plug would do that.

i'll be looking into that tonight. thanks for the help.

10-31-2018, 07:20 PM	#1
ddc456 Active Member Join Date: Jan 2014 Location: Bend Oregon Posts: 163	1978 K30 Gauge issues-HELP HELP HELP I'm at a loss on where to look. none of the gauges or lights in the dash are working. It's only when i lift the turn signal to the right that both turn signal indicators and the blue light indicators for the hi beams start flashing like my hazard are on....... The ground off of the wiring harness inside the cab is connected to the BUSS Ground connector...like i said, i don't know where to look next. Anyone been in the same situation? what or where should i try next? Thanks

11-01-2018, 08:00 AM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,225	Re: 1978 K30 Gauge issues-HELP HELP HELP What is the condition of you circuit board on the backside of you gauge cluster? Mine is messed up and seems to be causing a similar short there. I am in the process of replacing that circuit board now. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

11-01-2018, 11:04 AM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: 1978 K30 Gauge issues-HELP HELP HELP Are all of the black ground wires solidly connected back to the buss bar? The Ground and power wires have splices in the harness about 6-8" from the cluster plug. These can loosen up. Printed circuit issues would cause this as well. Do your gauges work? __________________ 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.

11-01-2018, 02:17 PM	#6
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: 1978 K30 Gauge issues-HELP HELP HELP That sounds like a bad ground. __________________ 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.

11-01-2018, 04:42 PM	#7
andyh1956 Registered User Join Date: Mar 2010 Location: thomastown mississippi Posts: 1,261	Re: 1978 K30 Gauge issues-HELP HELP HELP My S10 did this XACT same thing! Ground strip that grounded the gauge pod at the pod plug was open.

11-05-2018, 03:00 PM	#8
ddc456 Active Member Join Date: Jan 2014 Location: Bend Oregon Posts: 163	Re: 1978 K30 Gauge issues-HELP HELP HELP Bad ground at the Buss Bar was the problem. Now i just need to figure why the fuel gauge isn't working. Stuck on "E" even switching tanks....

11-05-2018, 03:07 PM	#9
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: 1978 K30 Gauge issues-HELP HELP HELP A dead shorted sender wire between the valve and the cluster plug would do that. __________________ 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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