1984 GMC C60 What went wrong while sitting? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jmh68C10 · 01-30-2017, 12:09 PM

I have a 1984 C60 with a 366 gas engine. Truck ran great when parked a year ago but now is getting no spark. Ideas?

77 C-20 Scottsdale · 01-30-2017, 02:12 PM

Start by checking the wiring. Make sure rats or rabbits have not chewed the wires.

maxx442 · 01-30-2017, 02:22 PM

Distributor cap/rotor contacts may be corroded or oxidized. I'd also check your coil. Could be as simple as a loose ground.

demian5 · 01-30-2017, 07:52 PM

Quote:

Originally Posted by 77 C-20 Scottsdale

Start by checking the wiring. Make sure rats or rabbits have not chewed the wires.

Make sure the wire from the starter to the coil wasn't eaten.

geezer#99 · 01-30-2017, 08:04 PM

Quote:

Originally Posted by demian5

Make sure the wire from the starter to the coil wasn't eaten.

It doesn't have one.
It's an hei.

johnthegreat508 · 01-30-2017, 08:05 PM

Decomposed coil. Most likely corrosion of distro of connectors in the ignition wiring.

cadillac_al · 01-31-2017, 08:19 AM

If you have 12 volts at the distributor then it is the module. They can die anytime anywhere, especially after 30 years.

**special-K** · 01-31-2017, 08:49 AM

Corrosion. I'd pull the coil out of the cap and check there, as well as inside the distributor. First try cleaning all that up with Lectramotive. Could be carbon tracks from bad cap.

andyh1956 · 01-31-2017, 11:58 PM

HEI's are notorious for the rotor buttons going bad.

Jmh68C10 · 02-05-2017, 12:12 PM

Anyone have a wiring diagram of the wiring coming out of the HEI distributer? This looks a little suspicious.

nonstop · 02-05-2017, 01:20 PM

The battery one next to it is still connected, right? That looks like it may have gone to a tach (tach terminal is next to the battery). Is there any chance it was touching ground? May be your problem right there. Try disconnecting it. Truck should run without it.

After looking again, hard to tell from the picture, but if that runs to the battery terminal of the cap, then that is your problem. It needs to be reconnected to the wire from the ignition. What is that heavy gauge pink wire connected to laying across the manifold? That looks like it should be the batter wire for the HEI.

01-30-2017, 12:09 PM	#1
Jmh68C10 Registered User Join Date: Nov 2016 Location: Richmond Va Posts: 68	1984 GMC C60 What went wrong while sitting? I have a 1984 C60 with a 366 gas engine. Truck ran great when parked a year ago but now is getting no spark. Ideas? Attached Images __________________ 68 c10- Under construction

01-30-2017, 02:12 PM	#2
77 C-20 Scottsdale Registered User Join Date: May 2015 Location: Ridgecrest, Ca. Posts: 18	Re: 1984 GMC C60 What went wrong while sitting? Start by checking the wiring. Make sure rats or rabbits have not chewed the wires.

01-30-2017, 02:22 PM	#3
maxx442 Registered User Join Date: Jan 2017 Location: Ellicott, CO Posts: 51	Re: 1984 GMC C60 What went wrong while sitting? Distributor cap/rotor contacts may be corroded or oxidized. I'd also check your coil. Could be as simple as a loose ground.

01-30-2017, 08:05 PM	#6
johnthegreat508 Registered User Join Date: Jan 2017 Location: Humboldt County, CA Posts: 19	Re: 1984 GMC C60 What went wrong while sitting? Decomposed coil. Most likely corrosion of distro of connectors in the ignition wiring. __________________ 1973 Chevrolet C10 Stepside 454

01-31-2017, 08:19 AM	#7
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,354	Re: 1984 GMC C60 What went wrong while sitting? If you have 12 volts at the distributor then it is the module. They can die anytime anywhere, especially after 30 years. __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10

01-31-2017, 08:49 AM	#8
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: 1984 GMC C60 What went wrong while sitting? Corrosion. I'd pull the coil out of the cap and check there, as well as inside the distributor. First try cleaning all that up with Lectramotive. Could be carbon tracks from bad cap. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

01-31-2017, 11:58 PM	#9
andyh1956 Registered User Join Date: Mar 2010 Location: thomastown mississippi Posts: 1,261	Re: 1984 GMC C60 What went wrong while sitting? HEI's are notorious for the rotor buttons going bad.

02-05-2017, 12:12 PM	#10
Jmh68C10 Registered User Join Date: Nov 2016 Location: Richmond Va Posts: 68	Re: 1984 GMC C60 What went wrong while sitting? Anyone have a wiring diagram of the wiring coming out of the HEI distributer? This looks a little suspicious. Attached Images __________________ 68 c10- Under construction

02-05-2017, 01:20 PM	#11
nonstop Registered User Join Date: Dec 2014 Location: Northern California Posts: 422	Re: 1984 GMC C60 What went wrong while sitting? The battery one next to it is still connected, right? That looks like it may have gone to a tach (tach terminal is next to the battery). Is there any chance it was touching ground? May be your problem right there. Try disconnecting it. Truck should run without it. After looking again, hard to tell from the picture, but if that runs to the battery terminal of the cap, then that is your problem. It needs to be reconnected to the wire from the ignition. What is that heavy gauge pink wire connected to laying across the manifold? That looks like it should be the batter wire for the HEI. Last edited by nonstop; 02-05-2017 at 01:29 PM.



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