ignition switch problem?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JIMs70GMC** · 11-09-2004, 07:24 PM

Here's the long story: The 71 K20 I got from Dean was starting hard in the morning, and when it did start it was running rich because I flooded it trying to start it. I verified choke adjustment, and carb settings everything good. Well after helping a buddy w/ his 58(someone had fun w/ the ignition switch and internally regulated alt) I got to thinking is the coil getting the voltage at start up. Well with the key in run, I had 5 V on the + terminal of the coil, had my wife try and start it while measuring voltage and only 8 V. I then jumpered from the + of the battery to the + of the coil with my wife turning it over and still would not start. I then had her giggle the key in the ignition(jumper removed) and the meter voltage jumped up to 9 V(not start) then I told her to hit it and the meter jumped to 12V and the truck fired right up. I'm talking in the matter of 10 minutes all this happened and it fast idled smoothly, and no black smoke. Talk about needing a woman's touch. Time to replace the ignition switch.

Robert1970C20rstbukt · 11-09-2004, 07:37 PM

At least these are easy to replace, and cheap. I got mine from Autozone, it was like $10 with tax.

Longhorn Man · 11-09-2004, 09:10 PM

Take a good look at the plug going to the ignition switch too....I'll bet a punch in the gut that you have a couple dirty or melted terminals.

**JIMs70GMC** · 11-09-2004, 09:13 PM

Didn't think about that. Guess I won't drive it in the morning. I'll try and start it though. Thanks,

Hooter · 11-10-2004, 01:45 AM

had the same problem with ye ole Ford, wouldnt start if I used the key, but if i went under the hood with the key on and jumped the starter soleniod, it would fire right up, so replaced the ignition switch and I was on my way

**JIMs70GMC** · 11-10-2004, 04:21 PM

Replaced the ignition switch and truck fired right up. Thanks,

11-09-2004, 07:24 PM	#1
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	ignition switch problem?? Here's the long story: The 71 K20 I got from Dean was starting hard in the morning, and when it did start it was running rich because I flooded it trying to start it. I verified choke adjustment, and carb settings everything good. Well after helping a buddy w/ his 58(someone had fun w/ the ignition switch and internally regulated alt) I got to thinking is the coil getting the voltage at start up. Well with the key in run, I had 5 V on the + terminal of the coil, had my wife try and start it while measuring voltage and only 8 V. I then jumpered from the + of the battery to the + of the coil with my wife turning it over and still would not start. I then had her giggle the key in the ignition(jumper removed) and the meter voltage jumped up to 9 V(not start) then I told her to hit it and the meter jumped to 12V and the truck fired right up. I'm talking in the matter of 10 minutes all this happened and it fast idled smoothly, and no black smoke. Talk about needing a woman's touch. Time to replace the ignition switch. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

11-09-2004, 07:37 PM	#2
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	At least these are easy to replace, and cheap. I got mine from Autozone, it was like $10 with tax. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

11-09-2004, 09:13 PM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Didn't think about that. Guess I won't drive it in the morning. I'll try and start it though. Thanks, __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

11-10-2004, 01:45 AM	#5
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	had the same problem with ye ole Ford, wouldnt start if I used the key, but if i went under the hood with the key on and jumped the starter soleniod, it would fire right up, so replaced the ignition switch and I was on my way __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

11-10-2004, 04:21 PM	#6
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Replaced the ignition switch and truck fired right up. Thanks, __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

11-09-2004, 09:10 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Take a good look at the plug going to the ignition switch too....I'll bet a punch in the gut that you have a couple dirty or melted terminals.



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