Voltage Part 2...
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Fleet Mechanic
Joined: Mar 2004
Posts: 1,483
Likes: 1
From: SE PA
Voltage Part 2...
As some of you may remember, my 2005 V10 Ex experienced, as Rolls Royce would say..."to cease forward motion". It was determined that my freshly rebuilt alternator wasn't the issue, but was related to the 3 pin connector. A part placed into the alternator during the rebuilt was casing the 3 pin connector to not remain connected. I corrected this with a new pigtail.
Monday, I drove the Ex to NY to look at an old car for sale. On the return trip, my voltage was running as low as 13.1V. After 30 minutes or so...it went back to 13.8v for the rest of the trip. I'm reading this from the ScanGauge plugged into the OBD port. I know this reads a little less than actual...but I cannot understand the reason for the variation.
The alternator shop seems to think I should make up a cigarette lighter plug with a volt gauge more directly monitoring.
Glad for your thoughts!
Monday, I drove the Ex to NY to look at an old car for sale. On the return trip, my voltage was running as low as 13.1V. After 30 minutes or so...it went back to 13.8v for the rest of the trip. I'm reading this from the ScanGauge plugged into the OBD port. I know this reads a little less than actual...but I cannot understand the reason for the variation.
The alternator shop seems to think I should make up a cigarette lighter plug with a volt gauge more directly monitoring.
Glad for your thoughts!
Thread Starter
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Fleet Mechanic
Joined: Mar 2004
Posts: 1,483
Likes: 1
From: SE PA
Well, this is interesting. Maybe it's time to pull the ScanGauge.
Engine idling, front and rear A/C blowing, rear defrost on. Voltmeter says 14.1. ScanGauge says 13.5. Going to try another voltmeter, too. Have to wonder why they are so different...
Lots of on-line searching, and it seems that these ScanGauges regularly displays as much as .5V too little compared to actual battery voltage. Some say it's because It monitors data sent from the computer and other suggest it's the wiring length that causes this...
Engine idling, front and rear A/C blowing, rear defrost on. Voltmeter says 14.1. ScanGauge says 13.5. Going to try another voltmeter, too. Have to wonder why they are so different...
Lots of on-line searching, and it seems that these ScanGauges regularly displays as much as .5V too little compared to actual battery voltage. Some say it's because It monitors data sent from the computer and other suggest it's the wiring length that causes this...
Posting Guru
Joined: Feb 2015
Posts: 1,394
Likes: 1
From: Loveland,CO
I personally do not count on any of those type of gauges reading from the PCM. I have a actual gauge wired in to read the voltage as well as everything else I want to monitor...Autometer is my best friend!!
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