Home
What's new
Latest activity
Authors
Store
Latest reviews
Search products
Forums
New posts
Search forums
What's new
New posts
New listings
New products
New profile posts
Latest activity
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
Cart
Cart
Loading…
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Search titles only
By:
Menu
Log in
Register
Navigation
Install the app
Install
More options
Change style
Contact us
Close Menu
Forums
Cobra Forums
The Terminator
Terminator Talk
Aeroforce voltage reading inaccurate
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="cj428mach" data-source="post: 15598479" data-attributes="member: 142081"><p>I believe some of it is the voltage lost through the system. Back in the Fbody days you'd lose a lot of system voltage going through the ignition switch. </p><p></p><p>Here's something I found on a vette forum. </p><p></p><p>"The PCM determines what the output of the alternator should be. So, if the PCM is happy at 13.1 volt output of the alternator, thats what you get. When you step on the <a href="http://rover.ebay.com/rover/13/0/19/DealFrame/DealFrame.cmp?bm=367&BEFID=96424&acode=306&code=306&aon=&crawler_id=208580983&dealId=WAee_CYOYs3Cv74cPEkfHQ%3D%3D&searchID=&url=https%3A%2F%2Fautoplicity.com%2F9906814-trailfx-fx1003-2003-2007-classic-chevy%3Futm_source%3DShoppingCom%26utm_medium%3DCSE%26utm_campaign%3DShoppingComNOFITMENT&DealName=Trail%20Fx%20Fx1003%20Disc%20Brake%20Pad&MerchantID=507376&HasLink=yes&category=0&AR=-1&NG=1&GR=1&ND=1&PN=1&RR=-1&ST=&MN=msnFeed&FPT=SDCF&NDS=1&NMS=1&NDP=1&MRS=&PD=0&brnId=2455&lnkId=8070676&Issdt=170507051359&IsFtr=0&IsSmart=0&dlprc=616.51&SKU=9906814" target="_blank">brakes</a>, turn on the HVAC FAN to HIGH ect..... and put a load on the charging system, the PCM has to see the drop in voltage and tell the alternator to increase output. This happens in fractions of a second but the delay is enough to cause a flicker in the lights and a movement on the gages. </p><p></p><p>If your seeing abnormal readings on the DIC or dash gage (what you perceive to be a LOW reading on the dash gages) put a voltmeter on the field terminal on the alternator and at the battery terminals and see what the ACTUAL readings are. You will be surprised in finding the actual battery voltages/alternator output is usually .5 to almost a full volt higher in some cases. So,,,,,,your 13.1 (which every one dreads seeing) is really 13.5 - 14.5. <img src="https://www.corvetteforum.com/forums/images/smilies/biggrin5.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />"</p><p></p><p>So as you can see they have the exact same issue when reading system voltage from the PCM.</p></blockquote><p></p>
[QUOTE="cj428mach, post: 15598479, member: 142081"] I believe some of it is the voltage lost through the system. Back in the Fbody days you'd lose a lot of system voltage going through the ignition switch. Here's something I found on a vette forum. "The PCM determines what the output of the alternator should be. So, if the PCM is happy at 13.1 volt output of the alternator, thats what you get. When you step on the [URL='http://rover.ebay.com/rover/13/0/19/DealFrame/DealFrame.cmp?bm=367&BEFID=96424&acode=306&code=306&aon=&crawler_id=208580983&dealId=WAee_CYOYs3Cv74cPEkfHQ%3D%3D&searchID=&url=https%3A%2F%2Fautoplicity.com%2F9906814-trailfx-fx1003-2003-2007-classic-chevy%3Futm_source%3DShoppingCom%26utm_medium%3DCSE%26utm_campaign%3DShoppingComNOFITMENT&DealName=Trail%20Fx%20Fx1003%20Disc%20Brake%20Pad&MerchantID=507376&HasLink=yes&category=0&AR=-1&NG=1&GR=1&ND=1&PN=1&RR=-1&ST=&MN=msnFeed&FPT=SDCF&NDS=1&NMS=1&NDP=1&MRS=&PD=0&brnId=2455&lnkId=8070676&Issdt=170507051359&IsFtr=0&IsSmart=0&dlprc=616.51&SKU=9906814']brakes[/URL], turn on the HVAC FAN to HIGH ect..... and put a load on the charging system, the PCM has to see the drop in voltage and tell the alternator to increase output. This happens in fractions of a second but the delay is enough to cause a flicker in the lights and a movement on the gages. If your seeing abnormal readings on the DIC or dash gage (what you perceive to be a LOW reading on the dash gages) put a voltmeter on the field terminal on the alternator and at the battery terminals and see what the ACTUAL readings are. You will be surprised in finding the actual battery voltages/alternator output is usually .5 to almost a full volt higher in some cases. So,,,,,,your 13.1 (which every one dreads seeing) is really 13.5 - 14.5. [IMG]https://www.corvetteforum.com/forums/images/smilies/biggrin5.gif[/IMG]" So as you can see they have the exact same issue when reading system voltage from the PCM. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Cobra Forums
The Terminator
Terminator Talk
Aeroforce voltage reading inaccurate
Top