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I have a 350 engine gmc 1977 went to put new connecters on the wires to the alternator and one of wires touch the header and sparked i had my battery still connected daa now i have no power at all, what got fried ignition switch, relays i dont no need help

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  • ricky Feb 19, 2012

    did not see any burnt fuses in the fuse box

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  • 40 Answers

Your hot wire was grounded when it sparked, it burned the fuse involving that circuit to protect from a short , just replace burnt fuse inside of fuse box.

Posted on Feb 19, 2012

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SOURCE: find tdc 1977 chev 350 engine

first remove number 1 spark plug, this is the front first plug on the driver side.put your finger over the hole and have someone bump it over until you get compression blowing your finger off the hole tell them to stop. then look on your harmonic balancer and line up the notch on balancer to the wide gap on the pointer. when this is lined up your then on number one compression stroke.

Posted on Jul 12, 2010

megabuck
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SOURCE: The alternator is charging the

It sounds like the bearing is going out and when you connect it and disconnect it this places more stress when it is on thus cause it to scream .It still can work even tho it it screams but one day it will go out and you can get stuck broke down.FIX; I would take it to a qualified shop and have them replace it or you can replace it yourself just be careful to note where the wires go.Thank you for your questions

Posted on Apr 29, 2011

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1 Answer

Have new battery,alternator, starter and battery still goes dead on my gmc 2003 safariif i the voltage on the battery its about 7 and then it dies completly


you have a SHORTED, CONDITION, you need to inspect all wires within this circuit, including all grounds. are all your connections right ? with engine running is your battery showing 12 to 14 volts, is your starter connected properly, reinspect all wiring in this cicuit, are your battery cables in good shape ? make sure no other wires are touching wires in this charging circuit . have a parts store check the charging circuit for you . have them check the battery, and the alternator, one dead cell in battery can cause your problem, also even a new alternator can be bad !!!

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Battery Light still on


The new alternator is probably ok.
I would say you burned a fuseable link in the wiring harness.
The alternator has a fuse wire between it and the battery to protect it from overload.
Have someone check the wires coming out of the back of the alternator. The big wire should have battery voltage, the small wires energize the alternator when you start the engine.

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1977 Chevy 350 truck wiring diagram


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  1. Check the wiring of the new radio installed as follows..
  2. Disconnect battery ground
  3. verify radio ground wire is grounded to metal
  4. verify radio hot wire (normally red and thick) is connected to a power source that is off when the ignition key is in the "off" position.
  5. verify that the always hot wire is connect to a constant 12v power supply even with the ignition off.
  6. make sure the pwr antenna wire if not used is taped at the tip and not touching any metal.
  7. verify that all speaker wires are connect correctly and not shorted to ground.
  8. connect battery ground you may get a small spark if your courtesy lites work.
  9. start engine verify your battery is charging by disconnecting the battery ground cable while the engine is running, it should continue running if it don't, alternator maybe bad.
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