electrical issues on my 72" C20 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

PIG-TECH · 03-10-2016, 06:38 PM

was driving down a bumpy road and all of a sudden i lost all power to the truck. no lights,ignition ect.....
so what i have done so far is all new battery connection. starter is good, new fuses. i also striped the red power wire coming out of the fire wall to the alternator lights ect..., and ran a wire strait from the battery to the splice and the truck started and lights came on so now what? the picture below shows the wire i striped. my question: is the purple wire my feed and what can i do next to trouble shoot my problem

PIG-TECH · 03-10-2016, 06:47 PM

i also installed a new ignition switch, pig tail and tumbler

swamp rat · 03-10-2016, 07:52 PM

Quote:

Originally Posted by PIG-TECH

i also installed a new ignition switch, pig tail and tumbler

Well that killed my first thought..

swamp rat · 03-10-2016, 07:54 PM

Did you check the IGN fuse under the dash?

There are schematic's in the forum in the electrical section, do an advanced search for electrical schematic.

PIG-TECH · 03-10-2016, 08:02 PM

thanks mike, all the schematics i see have the generator and volt reg. when i bought my truck it had a alternator throws off the schematics a little. and none i have seen show under the dash wiring

PIG-TECH · 03-10-2016, 10:13 PM

well the problem is solved i replaced the lead to the positive post from my battery to the junction box on the fender. its all fun and games till you have electrical issues

swamp rat · 03-10-2016, 10:36 PM

The purple wire going to the starter will be dead until the switch is turned to the start position, have someone turn the key to start when you have a test light or multi meter on that connection and ground. if turning the key lights the circuit and the starter won't crank then the solenoid went bad, if it does not lite then its probable the switch may be bad.

A good thread showing the fuse panel if needed:

http://67-72chevytrucks.com/vboard/s...d.php?t=699612

Post 18 shows how to mod for the 3 wire alternator:

http://67-72chevytrucks.com/vboard/s...9&postcount=18

Post #1 or 6 has links to a larger version of the schematic

http://67-72chevytrucks.com/vboard/s...d.php?t=185856

03-10-2016, 06:47 PM	#2
PIG-TECH Registered User Join Date: Jun 2015 Location: weirton WV Posts: 76	Re: electrical issues on my 72" C20 i also installed a new ignition switch, pig tail and tumbler

03-10-2016, 07:54 PM	#4
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	Re: electrical issues on my 72" C20 Did you check the IGN fuse under the dash? There are schematic's in the forum in the electrical section, do an advanced search for electrical schematic. __________________ Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's

03-10-2016, 08:02 PM	#5
PIG-TECH Registered User Join Date: Jun 2015 Location: weirton WV Posts: 76	Re: electrical issues on my 72" C20 thanks mike, all the schematics i see have the generator and volt reg. when i bought my truck it had a alternator throws off the schematics a little. and none i have seen show under the dash wiring

03-10-2016, 10:13 PM	#6
PIG-TECH Registered User Join Date: Jun 2015 Location: weirton WV Posts: 76	Re: electrical issues on my 72" C20 well the problem is solved i replaced the lead to the positive post from my battery to the junction box on the fender. its all fun and games till you have electrical issues

03-10-2016, 10:36 PM	#7
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	Re: electrical issues on my 72" C20 The purple wire going to the starter will be dead until the switch is turned to the start position, have someone turn the key to start when you have a test light or multi meter on that connection and ground. if turning the key lights the circuit and the starter won't crank then the solenoid went bad, if it does not lite then its probable the switch may be bad. A good thread showing the fuse panel if needed: http://67-72chevytrucks.com/vboard/s...d.php?t=699612 Post 18 shows how to mod for the 3 wire alternator: http://67-72chevytrucks.com/vboard/s...9&postcount=18 Post #1 or 6 has links to a larger version of the schematic http://67-72chevytrucks.com/vboard/s...d.php?t=185856 __________________ Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's

03-10-2016, 06:38 PM	#1
PIG-TECH Registered User Join Date: Jun 2015 Location: weirton WV Posts: 76	electrical issues on my 72" C20 was driving down a bumpy road and all of a sudden i lost all power to the truck. no lights,ignition ect..... so what i have done so far is all new battery connection. starter is good, new fuses. i also striped the red power wire coming out of the fire wall to the alternator lights ect..., and ran a wire strait from the battery to the splice and the truck started and lights came on so now what? the picture below shows the wire i striped. my question: is the purple wire my feed and what can i do next to trouble shoot my problem Attached Images



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