66 Chevy K10,Odd wiring problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

66K10383 · 03-28-2012, 02:15 PM

Hi, I have a 1966 Chevy K10 pickup.there have been problems in the past with minor wiring issues like the starter wiring harness grounding power to my coil.
Thankfully I was able to fix that with the guidance of this site and my truck has ran great until last night.

I was on my was home from work and my stereo cut out, it lost power but the backlight was still on. its happened a handfull of time before but always powered up seconds later. Well, this time it started flickering in away that would make my truck stumble and act like it was running out of gas. I stoped and looked under the dash near the stereo to find my heater control plug half plugged in. I pushed it all the way on and fired up the truck. the problem seceded for about 3 miles then out of nowhere(to my knowledge) my stereo cut out again and all my guages would jump in a rymithic "pulsing" pattern almost at the pace of a blinker relay. While doing this my truck would run in a flowing Rommp,rommp rommp. pattern with the gauges.

I dont know alot about the old Chevys but I willing to learn. My only thoughts are maby ALT?? or voltage reg?Hopefully that makes alittle scence.

Thankyou

**Captainfab** · 03-29-2012, 12:25 AM

I would check that your alternator is putting out between 13.8 and 14.2 volts. One thing that often times is the culprit with electrical issues, is a bad or insufficient grounds. Check to see that the battery ground has a good clean connection to the engine. Also your cab needs to be grounded either directly or indirectly to the engine and/or battery. Also check the wiring plugs at the firewall to be sure they are snug.

66K10383 · 03-29-2012, 01:03 AM

Thank you for the response. I started wiggling the wires around near the ignition and was able to find the cause.I got lucky. It turned out to be a bad connection on the lowest ignition switch terminal. I dont get how it could of caused those symptoms but they stopped or now.

However I will be sure to check all grounds and maby add a few where necessary.

Thankyou for your help

j.kirn · 03-29-2012, 01:16 AM

Dont forget to post some pics of your truck

Woogeroo · 03-29-2012, 05:54 AM

I had a freaky problem once... and it was the positive cable from the battery to the starter, it was just loose on the starter end... so it would start fine and then it wouldn't... I took it apart, cleaned it up good and added a lockwasher to it, not a problem since.

electrical issues are always fun.

/sarcasm.

-W

03-28-2012, 02:15 PM	#1
66K10383 Registered User Join Date: Jul 2011 Location: Spokane Posts: 42	66 Chevy K10,Odd wiring problems Hi, I have a 1966 Chevy K10 pickup.there have been problems in the past with minor wiring issues like the starter wiring harness grounding power to my coil. Thankfully I was able to fix that with the guidance of this site and my truck has ran great until last night. I was on my was home from work and my stereo cut out, it lost power but the backlight was still on. its happened a handfull of time before but always powered up seconds later. Well, this time it started flickering in away that would make my truck stumble and act like it was running out of gas. I stoped and looked under the dash near the stereo to find my heater control plug half plugged in. I pushed it all the way on and fired up the truck. the problem seceded for about 3 miles then out of nowhere(to my knowledge) my stereo cut out again and all my guages would jump in a rymithic "pulsing" pattern almost at the pace of a blinker relay. While doing this my truck would run in a flowing Rommp,rommp rommp. pattern with the gauges. I dont know alot about the old Chevys but I willing to learn. My only thoughts are maby ALT?? or voltage reg?Hopefully that makes alittle scence. Thankyou

03-29-2012, 12:25 AM	#2
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,247	Re: 66 Chevy K10,Odd wiring problems I would check that your alternator is putting out between 13.8 and 14.2 volts. One thing that often times is the culprit with electrical issues, is a bad or insufficient grounds. Check to see that the battery ground has a good clean connection to the engine. Also your cab needs to be grounded either directly or indirectly to the engine and/or battery. Also check the wiring plugs at the firewall to be sure they are snug. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

03-29-2012, 01:03 AM	#3
66K10383 Registered User Join Date: Jul 2011 Location: Spokane Posts: 42	Re: 66 Chevy K10,Odd wiring problems Thank you for the response. I started wiggling the wires around near the ignition and was able to find the cause.I got lucky. It turned out to be a bad connection on the lowest ignition switch terminal. I dont get how it could of caused those symptoms but they stopped or now. However I will be sure to check all grounds and maby add a few where necessary. Thankyou for your help

03-29-2012, 01:16 AM	#4
j.kirn Registered User Join Date: Jun 2006 Location: MO. Posts: 970	Re: 66 Chevy K10,Odd wiring problems Dont forget to post some pics of your truck

03-29-2012, 05:54 AM	#5
Woogeroo Registered User Join Date: Aug 2003 Location: tool box Posts: 3,115	Re: 66 Chevy K10,Odd wiring problems I had a freaky problem once... and it was the positive cable from the battery to the starter, it was just loose on the starter end... so it would start fine and then it wouldn't... I took it apart, cleaned it up good and added a lockwasher to it, not a problem since. electrical issues are always fun. /sarcasm. -W



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