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#1 |
Registered User
Join Date: Mar 2007
Location: Oregon
Posts: 109
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Hey all'
I went to use my '72 k20 today, it has been working great, and stopped to throw some stuff in the back. When I got back in, I turned the key and there was nothing. I checked around, I had no lights, hazards, heater, radio, NOTHING. I tried roll-starting with no luck, then went and got another rig and jumper cables. Again, nothing. I towed it home, got my elec tester out, and the battery is fully charged. I have power down to the starter solenoid, but no power coming out of the solenoid on the other terminals. Would a bad starter/solenoid cause a no power condition on the rest of the system? I've haven't had any electrical problems since I got it a year ago. Thanks in advance, Colby. P.S. it has a 350 motor and 4-speed. |
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#2 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Help! Sudden electrical problem
Did you check for power on the main feed wire to the cab?
It is a red #10 wire that goes from the terminal on the right fender across the radiator support and in the harness to the cab through the bulkhead connector. The wire has a fusible link in it which may have gone bad or there is a bad connection somewhere along the way. It is also possible for the battery connections to be be making partial connection, (enough to make your meter read but not enough of a connection to power up anything). Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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#3 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Help! Sudden electrical problem
a poor rusted up neglected ground wire will cause no juice to flo it is after all a two wire system
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#4 |
Registered User
Join Date: Sep 2007
Location: Mundelein, IL
Posts: 862
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Re: Help! Sudden electrical problem
Speaking of grounds, my abttery grounds to one of the water pump bolts; is this normal? The cable and its ends look original.
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time is inversely proportional to money; that's why it takes me so long 1967 K10 1967 Camaro |
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#5 |
To The Levy
Join Date: Jan 2007
Location: california
Posts: 391
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Re: Help! Sudden electrical problem
I agree with Jim,,, check your main supply to cab, usually runs to that little black junction, and can have either fusible link wire or fuse (stock is a fuse,) and runs in that plastic cover along the radiator support.
always follow from source up, to dertermine loss of power. |
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#6 | |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Help! Sudden electrical problem
Start at the source, the battery cables, tight clean connections then the negative ground and the positive at the starter. BTW the positive ends at the starter no power will show at the solenoid until the key is turned to the start position.All positive power comes from the red wire stated above. The red wire feeds the key switch and the light switch, the horn relay and then the key switch feeds the fuse panel and the starter solenoid.
Quote:
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#7 |
On the college boy budget...
Join Date: Oct 2005
Location: Athens, Georgia
Posts: 370
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Re: Help! Sudden electrical problem
For what it's worth, I had a VERY similar problem just last week. Went to fire up the truck, nothing, and then just like you described absolutely couldn't get anything else on the truck to work. I thought something was shorting out the truck but I couldn't find anything obviously wrong (however the previous owner did a real number on the wiring in my truck).
Feeling at a complete loss I decided what the hell, I'll just disconnect the battery cables and reconnect them. Well it did the trick and the truck started right up when I went to see if that had done anything. I didn't notice if the cables were on the battery tight or not when I took em off but they definitely weren't corroded or anything.
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-'68 C10 short/step- 350/350 |
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#8 |
Registered User
Join Date: Mar 2007
Location: Oregon
Posts: 109
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The small wire that runs from the positive battery terminal (along with the regular battery cable) had pulled loose from the black junction box on the inner fender. Somebody hadn't crimped the little ring terminal onto the wire very well and it finally pulled out. Of course, I didn't figure this out until I had R&Rd the starter to test it. Oh well, thats the fun of these old trucks! Thanks to all who responded!
Colby. BTW I put pictures of the truck in the new photo album. |
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#9 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Help! Sudden electrical problem
thats why i hate crimp connectors other than for a temp fix ,theres nothing like a soldered joint for a permanent repair
__________________
71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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