Measuring Electricity - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old Jan 8th, 06, 07:31 AM Thread Starter
Gold Lifetime Member
Jim
 
Join Date: Dec 1999
Location: Yorkville, Illinois USA
Posts: 22,121
Measuring Electricity

sorry guys





To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
New website for my vert is coming together. Do ya like the slide show on the home page?

Last edited by JimM; Jan 4th, 10 at 06:52 PM.
JimM is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old Jan 8th, 06, 07:13 PM
Senior Tech
Scott
 
Join Date: Apr 2005
Location: CA
Posts: 239
Re: Measuring Electricity

Jim, excellent work!

Let me add a little concerning the internal resistance of voltmeters.

If you are measuring voltage on very low current circuits such as electronic engine controls on modern vehicles, a voltmeter with an internal resistance (impedance) of at least 10 mega ohms is specified. I've never seen an analog voltmeter that meets this spec.

If the resistance of the voltmeter is not high enough, just taking the measurement can affect the voltage of the circuit enough to not only make the reading invalid, but can also affect the circuit to a point that the engine runs differently.

Just a word of warning to those using an analog meter to test sensors and such on their fuel injected vehicles.

Thanks Jim, keep up the good work.
red67camaro is offline  
post #3 of 8 (permalink) Old Jan 8th, 06, 08:44 PM
Gold Lifetime Member
Larry
 
Join Date: Oct 1999
Location: Alamogordo, NM, USA
Posts: 988
Re: Measuring Electricity

Lookin' good Jim.

Can I add something too? Using a test light and maybe even an old analog voltmeter for cars that have computers could damage some of the sensitive circuits from the high ampearge draw of the light bulb. As far as any sensitive circuit is concerned, the bulb would be direct short to ground.

Larry
69-er is offline  
 
post #4 of 8 (permalink) Old Jan 9th, 06, 06:13 AM Thread Starter
Gold Lifetime Member
Jim
 
Join Date: Dec 1999
Location: Yorkville, Illinois USA
Posts: 22,121
Re: Measuring Electricity

OK OK... I'll add a bit of a disclaimer regarding newer cars... itsa short peice and there is room.... Did they make any cars after 1969?





To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
New website for my vert is coming together. Do ya like the slide show on the home page?
JimM is offline  
post #5 of 8 (permalink) Old Jan 9th, 06, 08:47 PM
Gold Lifetime Member
Larry
 
Join Date: Oct 1999
Location: Alamogordo, NM, USA
Posts: 988
Re: Measuring Electricity

Quote:
Originally Posted by JimM
Did they make any cars after 1969?
You make a good point... Did they make any cars after 69?

But, seriously, we are talking about pre-computer cars 99% of the time. But, ya never know...

Larry
69-er is offline  
post #6 of 8 (permalink) Old Jan 10th, 06, 03:20 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,657
Garage
Re: Measuring Electricity

Good article, JimM. A DMM ( Digital MultiMeter) operator's tip.

When measuring resistance and the DMM shows a negative sign on the display along with a value, the negative sign is indicating to the operator the presence of voltage across the unit being measured.

The numeric value shown will not be the correct ohms value. The operator must isolate the component to get a correct ohms reading.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden enjoy your next chapter.
Everett#2390 is offline  
post #7 of 8 (permalink) Old Jan 10th, 06, 05:30 AM
Gold Member
Todd
 
Join Date: Nov 2001
Location: Quartz Hill, CA, USA
Posts: 339
Thumbs up Re: Measuring Electricity

JimM
Awesome job!
Al put him in for a raise!
Electrical section coming right along, Fluke meters are the best
for any electrical system but gosh do they get spendy.
Site's getting better all the time.

Todd

69Z

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
VI018DZ is offline  
post #8 of 8 (permalink) Old Mar 3rd, 06, 09:29 PM
Moderator
David Pozzi
 
davidpozzi's Avatar
 
Join Date: Nov 1999
Location: Central California, USA
Posts: 10,080
Re: Measuring Electricity

Here is battery state of charge info:
STATE
OF
CHARGE ----VOLTS
100%---------12.66
75%----------12.45
50%----------12.24
25%----------12.06
0%-----------11.89

With engine running, you need to see 13.5 to 14.5 volts at the battery. If there is less than that, the altenator is not producing enough volts to fully charge the battery.

Check my web page for First Gen Camaro suspension info:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

67 RS 327 original owner. 1965 Lola T-70

Last edited by davidpozzi; Mar 3rd, 06 at 09:41 PM.
davidpozzi is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome