Electricity is Magic

enkeivette

enkeivette

Well-known member
Joined
Mar 30, 2008
Messages
990
So I was plumping my motor for a first fire since my 2nd piston replacement yesterday, and I connect the battery... smoke from around the starter... dead electrical system after that. Found a melted fusible link. So I did a continuity test between that hot wire and ground, and it was a short. The other wire was not.

So I traced the few wires that I touched (including an alternator that I replaced at the same time) found the alternator stud was grounding on my cylinder head. Took the alternator off, did the continuity test again thinking I solved the problem. Nope... still a short. Then I thought... maybe it's just a circuit (batt is disconnected) that is tripping up my continuity test. So I did an impedance test... 1.3 ohms between the hot wire and my valve cover.

Thinking there is no way there is only 1.3 ohms between hot and ground without a short, I figured I melted some hot wire to ground somewhere. I was seconds away from giving up, and seeing if Big Bird would let me hire him to fix this when I thought, maybe I'm just an idiot and 1.3 ohms is normal. So I tape a fuse inline with the two ends of the melted fusible link, hook up the battery and all is fine???

Really?! Just 1.3 ohms between hot and ground with the battery diconnected and alternator disconnected? What is constantly hooked up with an impedance that low?!
 
impedance = AC
DC = resistance (ohms)

I guess you just got the nomenclature mixed up?
 
I would need more information Adam. I cannot tell by this story specifically just what you were reading. :)
 
Come ON bird, I know you know how to put the smoke back in the wire for the helpless kid.....

:surrender::censored::smash::twitch::flash::shocking::shocking:
 
Ohms law...E(Volts)=I(Amps)xR(Resistance in ohms). Thus, Amps=Voltage/Resistance. 12/1.3=9.23 amps. It sounds like either the ignition switch or light switch is on.
 
Twin_Turbo said:
impedance = AC
DC = resistance (ohms)

I guess you just got the nomenclature mixed up?
Click to expand...

Guess so, I thought my Dad (electrical engineer) always used the term impedance when talking about voice coil resistance. Thought impedance meant the amount of resistance measured in ohms???
 
big2bird said:
I would need more information Adam. I cannot tell by this story specifically just what you were reading. :)
Click to expand...

Hot red wire coming from terminal on the starter (same post as fat black hot wire). Reading from this wire, to ground (valve cover). Multimeter read: 1.3 Omega.

It's ok, it's just curiosity at this point. The car runs just fine.
 
big_G said:
Ohms law...E(Volts)=I(Amps)xR(Resistance in ohms). Thus, Amps=Voltage/Resistance. 12/1.3=9.23 amps. It sounds like either the ignition switch or light switch is on.
Click to expand...

Yeah, the drivers side door was open. So the interior lights were on. Guess I thought lights would have had more resistance, but maybe not.
 
enkeivette said:
Twin_Turbo said:
impedance = AC
DC = resistance (ohms)

I guess you just got the nomenclature mixed up?
Click to expand...

Guess so, I thought my Dad (electrical engineer) always used the term impedance when talking about voice coil resistance. Thought impedance meant the amount of resistance measured in ohms???
Click to expand...

ONE thing to understand, that any inductive load, like a voice coil or transformer, whatever...will change load characteristics with the frequency of the applied voltage....

so if you feed a a/c voltage at say 60 hz into a coil, it is going to represent a certain load, depending on what it is...speaker, transformer, etc....

now we raise the frequency of the a/c input voltage to say 1000 hz and you have a greatly raised input IMPEDANCE to the voltage, it will not draw as much power....represent a load....

it's as if the coil/load has a memory that it will not load as much at LO frequency applied as it will at HIGH freq applied, same voltage, same available currents....but the coil reacts different....

then we get into capacitve reactance....the above was inductiver reactance.....capacitive reactance is just the opposite....greater freq, it presents MORE loading to the power source.....

My uncle was a EE, from Case Inst. Tech....and so explained all that shit pretty good when I was in like 8th grade...

:twitch:;):bump:
 
mrvette said:
enkeivette said:
Twin_Turbo said:
impedance = AC
DC = resistance (ohms)

I guess you just got the nomenclature mixed up?
Click to expand...

Guess so, I thought my Dad (electrical engineer) always used the term impedance when talking about voice coil resistance. Thought impedance meant the amount of resistance measured in ohms???
Click to expand...

ONE thing to understand, that any inductive load, like a voice coil or transformer, whatever...will change load characteristics with the frequency of the applied voltage....

so if you feed a a/c voltage at say 60 hz into a coil, it is going to represent a certain load, depending on what it is...speaker, transformer, etc....

now we raise the frequency of the a/c input voltage to say 1000 hz and you have a greatly raised input IMPEDANCE to the voltage, it will not draw as much power....represent a load....

it's as if the coil/load has a memory that it will not load as much at LO frequency applied as it will at HIGH freq applied, same voltage, same available currents....but the coil reacts different....

then we get into capacitve reactance....the above was inductiver reactance.....capacitive reactance is just the opposite....greater freq, it presents MORE loading to the power source.....

My uncle was a EE, from Case Inst. Tech....and so explained all that shit pretty good when I was in like 8th grade...

:twitch:;):bump:
Click to expand...

What do you do for work? You seem to know an awful lot about this stuff...
 
enkeivette said:
Twin_Turbo said:
impedance = AC
DC = resistance (ohms)

I guess you just got the nomenclature mixed up?
Click to expand...

Guess so, I thought my Dad (electrical engineer) always used the term impedance when talking about voice coil resistance. Thought impedance meant the amount of resistance measured in ohms???
Click to expand...



there is no distinction between impedance and resistance; the latter can be thought of as impedance with zero phase angle.
 
enkeivette said:
mrvette said:
enkeivette said:
Twin_Turbo said:
impedance = AC
DC = resistance (ohms)

I guess you just got the nomenclature mixed up?
Click to expand...

Guess so, I thought my Dad (electrical engineer) always used the term impedance when talking about voice coil resistance. Thought impedance meant the amount of resistance measured in ohms???
Click to expand...

ONE thing to understand, that any inductive load, like a voice coil or transformer, whatever...will change load characteristics with the frequency of the applied voltage....

so if you feed a a/c voltage at say 60 hz into a coil, it is going to represent a certain load, depending on what it is...speaker, transformer, etc....

now we raise the frequency of the a/c input voltage to say 1000 hz and you have a greatly raised input IMPEDANCE to the voltage, it will not draw as much power....represent a load....

it's as if the coil/load has a memory that it will not load as much at LO frequency applied as it will at HIGH freq applied, same voltage, same available currents....but the coil reacts different....

then we get into capacitve reactance....the above was inductiver reactance.....capacitive reactance is just the opposite....greater freq, it presents MORE loading to the power source.....

My uncle was a EE, from Case Inst. Tech....and so explained all that shit pretty good when I was in like 8th grade...

:twitch:;):bump:
Click to expand...

What do you do for work? You seem to know an awful lot about this stuff...
Click to expand...

hehe...age 67 here, I built radios from vacuum tubes....in maybe 5th grade...age 10? and so went off into the ham radio club in HS, picked up the stereo sound hobby through the decades, got into computer in '95 when the 'net' caught on....alt.autos.corvette old what? UUnet?? been a while....

my ex FIL was a EE doing DOD work....I left electronics in '85 as a income, because it was all imported junk requiring more and more for less and less money...so went into home remodeling....

I"m retarreded these daze....but still get my fingers into shit....

keep my mind 1/2 way occupied anyway....

:crap::beer::shocking::p
 
Bullshark said:
enkeivette said:
Twin_Turbo said:
impedance = AC
DC = resistance (ohms)

I guess you just got the nomenclature mixed up?
Click to expand...

Guess so, I thought my Dad (electrical engineer) always used the term impedance when talking about voice coil resistance. Thought impedance meant the amount of resistance measured in ohms???
Click to expand...



there is no distinction between impedance and resistance; the latter can be thought of as impedance with zero phase angle.
Click to expand...

:shocking:

Oh come on man, don't bury the kid in snowballs....

Delta T is all in reactance....
 
enkeivette said:
Yeah, the drivers side door was open. So the interior lights were on. Guess I thought lights would have had more resistance, but maybe not.
Click to expand...


With no battery or alternator power, the lights were off. Incandescent light bulbs have a very low resistance when the filaments are room temperature. Their resistance becomes a lot higher when they are glowing hot.
 
mrvette said:
Bullshark said:
enkeivette said:
Twin_Turbo said:
impedance = AC
DC = resistance (ohms)

I guess you just got the nomenclature mixed up?
Click to expand...

Guess so, I thought my Dad (electrical engineer) always used the term impedance when talking about voice coil resistance. Thought impedance meant the amount of resistance measured in ohms???
Click to expand...



there is no distinction between impedance and resistance; the latter can be thought of as impedance with zero phase angle.
Click to expand...

:shocking:

Oh come on man, don't bury the kid in snowballs....

Delta T is all in reactance....
Click to expand...

Depends currents, if D/T is in phase with each other, we have F/R.....

so no current draw.....

for a/c power only of course....

:shocking:
 
68/70Vette said:
enkeivette said:
Yeah, the drivers side door was open. So the interior lights were on. Guess I thought lights would have had more resistance, but maybe not.
Click to expand...


With no battery or alternator power, the lights were off. Incandescent light bulbs have a very low resistance when the filaments are room temperature. Their resistance becomes a lot higher when they are glowing hot.
Click to expand...

Makes a lot of sense now that I think about it.
 
Bullshark said:
mrvette said:
:shocking:

Oh come on man, don't bury the kid in snowballs....

Delta T is all in reactance....
Click to expand...

Now that's the pot calling the kettle black! :lol: Careful Gene, or I will sic Brain Baskin on you! Ha Ha
Click to expand...

I had to set here and scratch my ass a minit to pick up on who that was....been what 5? years now....those variable speed fan controllers....using SCR's?? for dual spals and so forth.....need wired to the battery or they blow up...from ripple at 700 mv on the alt stud....

:hunter::club::tomato:
 
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