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#1 |
Registered User
Join Date: Sep 2012
Location: Oceanside, Ca
Posts: 9
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Hey I'm needing some serious help on my wiring issues. My 71 c10 was jot wired due to a lost key but then was wired back to the best of my knowledge. Now, a couple of months later, a new battery, alternator, voltage regulator and some burnt wires. My truck is dead. It is getting 13 volts once jumped, and the alternator reads the same. The left headlight went out again which was fixed when installed the new voltage regulator. I can't find any diagram of the 7 prong ignition nor do I know exactly which wire connects to its prong. Please help as my girlfriends daily driver sits patiently.
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#2 |
Msgt USAF Ret
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Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Ignition wiring issues
You need to go back and proofread your post and then slow down and give some better details about what has been done. I don't know about everyone else but I can't make head or tails out of what you are saying.
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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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#3 |
Registered User
Join Date: Sep 2012
Location: Oceanside, Ca
Posts: 9
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Re: Ignition wiring issues
Sorry about that.
I have a 350 a new battery, alternator, and voltage regulator. The ignition wiring from a 7 prong ignition, was pulled apart and hotwired to move the truck from a parking lot. I put the wires back to where I thought they went and the truck was running fine. One day the battery was dead and I replaced it. I already had a brand new alternator so I slapped that on. The truck started running for a few days and then kept losing the charge. I would jump it with my 04 Silverado SS and it would lose charge over night. Then driving it home it started smoking which I later discovered that a wired from the after market radio caught fires be melted the coating off. I can get it started but it starts to die after about 3 min of idling. I need to know which wires connect to which connector on the back of the ignition switch. Maybe I'm a bad researcher but I can't find anything and the schematics look like Swahili to me. I'm in the Marine Corps and don't have a lot of time nor money to get it fixed. Thanks VetteVet. Posted via Mobile Device |
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#4 | |
Msgt USAF Ret
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Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Ignition wiring issues
Quote:
so far I think I have determined that 1. Your switch is wired OK and 2. your alternator is not charging. Do you have the original external regulator or has it been converted to the newer internally regulated style? I see you bought a new regulator so I am guessing that is the external regulated alternator. I would recommend that you get the battery charged up right away and do it on a trickle charger. if you have access to a voltmeter the next time you have the engine running you should take a voltage reading at the large wire on the back of the alternator and to a good ground. It should read 13.5 to 14 volts dc at idle. If you read battery voltage at 12.5 then the alternator is not charging. A dead battery combined with a non charging alternator will not run an engine for long after a jump due to too low voltage for the ignition. The first thing to check if you get battery voltage on the alternator, is to check that the regulator is grounded to the radiator core support and there should be a ground wire going back to the alternator as well. I'm going to leave it here until you can post back with the checks.
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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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#5 |
Registered User
Join Date: Sep 2012
Location: Oceanside, Ca
Posts: 9
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Re: Ignition wiring issues
I did those things already and everything reads what it should on the voltameter. I'm pretty sure the wires aren't connected right in the switch cause I have 5 wires and 7 prongs. Purple, pink, white, red, and brownish one. The red wire has been added on to with the ken wood CD player and that is the wire that burnt. Should I replace the fuses? I still need the diagram to wire the ignition properly. I honestly was guessing when I put them back in. Also, volt gauges (both stock and aftermarket) read "0" while running and when connected (jumped) to my other truck.
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#6 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Ignition wiring issues
Here are some pictures that may help you .
This is the back of the key switch to compare with yours. Some models may vary. Do you have the gauge dash or the idiot light dash? This is the ignition switch wiring shown at the top of the diagram. This is the same diagram with the ignition switch shown at the top. This is how the ignition switch wires run into the fuse panel and the firewall block inside the cab. If you are getting the readings I specified then you should be charging the battery and keeping the system running. Where does the large red wire on the back of the alternator run to. Is it reading 12 volts with the key off and the engine not running. Do you get 12 volts on the brown wire at the regulator with the key on? Have you done a battery drain check? If your fuses are good then you don't need to replace them. Which ones are they and are the end connections clean and snug? Your voltmeters, how are they wired in? You are not confusing the battery gauge with a voltmeter are you?
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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 |
Registered User
Join Date: Sep 2012
Location: Oceanside, Ca
Posts: 9
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Re: Ignition wiring issues
Thanks I will try those things and get back to you. I have a gauge in the panel and aftermarket one. I will try to upload some pics to make things a little more clear.
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#8 |
Registered User
Join Date: Sep 2012
Location: Oceanside, Ca
Posts: 9
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Re: Ignition wiring issues
For days it was charging while running. Once it sat it drained the battery. Just recently it started smoking in the cab and then it puttered off idle and drained completely and wouldn't start even after the battery got enough charge. Once it sits for a day I try to charge the battery and start it. It will get started and idle and this last time smoked up the whole inside can. There's a wire underneath that was added on to the red wire (I think the aftermarket stereo) and it burned all the coating off of it. Also, before I changed the voltage regulator the headlight ( left) went out and would only work on highbream. The headlight came on once I replaced the regulator. However, when I burned that wire and smoked out the cab it went out again. Now what are your thoughts? This is frustrating me.
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#9 | |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Ignition wiring issues
Quote:
The headlight problem I suspect is a poor ground on the left headlight. Look at the 5 wires on the left headlight connector ( It's not a GMC is it) and trace the black wire to the ground on the radiator support. Clean this up and check the low beam to see if it's working. Check the connector as well for corrosion and clean it if need be.
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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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#10 |
Registered User
Join Date: Sep 2012
Location: Oceanside, Ca
Posts: 9
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Re: Ignition wiring issues
Okay so I checked everything and got the truck running. Was able to drive it about 2 miles. The cab wires didn't get hot or smoke, which is good. I did the battery drain test and there is drain somewhere. From what I understand I need to pull fuses and and check to see when the voltage drain stops. If it continues after the fuses are pulled what should I do?
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#11 | |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Ignition wiring issues
Quote:
The alternator large wire, The regulator, the horn relay, interior lights and exterior lights. Pull the alternator plug and the large wire and see if the drain goes away. Pull the regulator plug, check the horn relay if the horn if the horns are disconnected. The ground wire in the column for the horn may be touching the ground and keeping the relay energized. If the horns are connected they should blow but if some one disconnected them then the relay could still draw current. The lights should be obvious.
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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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#12 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: Ignition wiring issues
More then likeyy you have a bad alt, unhook the big wire on the back and see if the batteyr drain goes away if it does i'd do the swap to a new style alternator
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#13 |
Registered User
Join Date: Sep 2012
Location: Oceanside, Ca
Posts: 9
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Re: Ignition wiring issues
Okay. Maybe I'm not doing things right as far as checking for the drain. Am I checking for alternating current or direct current. With the negative cable disconnected and checking between the post and terminal wire AC reads 0.000. DC reads 12.76. And is consistently throughout all the parts I unplugged looking for the drain. However, with the key off, and terminals hooked up, it slowly drains approx .01 every 2 seconds. I will try to unplug the alternator and see if it goes away. Is the correct? Also, is it simple to upstage to a new style alternator? Same wiring hookups?
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#14 | |
Registered User
Join Date: Feb 2012
Location: Salado, Texas
Posts: 1,418
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Re: Ignition wiring issues
Quote:
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#15 |
Registered User
Join Date: Sep 2012
Location: Oceanside, Ca
Posts: 9
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Re: Ignition wiring issues
Thanks boynton, that's what my gut is telling me. However I do not have a green wire for the ground. I have a white, red, pink, purple, brown w/brown white wire.
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#16 |
Registered User
Join Date: Feb 2012
Location: Salado, Texas
Posts: 1,418
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Re: Ignition wiring issues
Take a good picture of what you have and post it on this thread
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#17 |
Registered User
Join Date: Sep 2012
Location: Oceanside, Ca
Posts: 9
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Re: Ignition wiring issues
Will do. Gotta get fat for turkey day first so after the food coma I will get up in there and take some pictures. Thinking of getting a new ignition switch cause its cheap and why the hell not
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#18 |
Registered User
Join Date: Feb 2012
Location: Salado, Texas
Posts: 1,418
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Re: Ignition wiring issues
If that is what you decide send me a pm I have the ignition switch from my old wiring harness I can sell you for cheap.
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