05-08-2021, 03:32 PM
|
#1 (permalink)
|
|
Human Environmentalist
Join Date: Aug 2010
Location: Oregon
Posts: 12,810
Thanks: 4,327
Thanked 4,478 Times in 3,443 Posts
|
How to measure parasitic drain
Here's my method of measuring parasitic drain of the 12v battery without losing memory settings.
|
|
|
|
|
The Following 2 Users Say Thank You to redpoint5 For This Useful Post:
|
|
 Today
|
|
|
|
Other popular topics in this forum...
|
|
|
|
|
05-08-2021, 05:09 PM
|
#2 (permalink)
|
|
Corporate imperialist
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 11,268
Thanks: 273
Thanked 3,569 Times in 2,833 Posts
|
I use a DC amp clamp.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
|
|
|
|
|
05-08-2021, 06:02 PM
|
#3 (permalink)
|
|
Human Environmentalist
Join Date: Aug 2010
Location: Oregon
Posts: 12,810
Thanks: 4,327
Thanked 4,478 Times in 3,443 Posts
|
Quote:
Originally Posted by oil pan 4
I use a DC amp clamp.
|
Yours is sensitive enough to measure a single mA?
DC clamp meters are rare to begin with, but the cheap ones I've seen are only sensitive to an amp or so. |
|
|
|
|
The Following User Says Thank You to redpoint5 For This Useful Post:
|
|
|
05-08-2021, 09:15 PM
|
#4 (permalink)
|
|
Corporate imperialist
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 11,268
Thanks: 273
Thanked 3,569 Times in 2,833 Posts
|
Yeah it wasn't cheap either.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
|
|
|
|
|
05-10-2021, 11:14 AM
|
#5 (permalink)
|
|
Somewhat crazed
Join Date: Sep 2013
Location: 1826 miles WSW of Normal
Posts: 4,425
Thanks: 540
Thanked 1,205 Times in 1,063 Posts
|
Put a 12 volt supply in parallel somewhere like typically the cigar lighter socket, then you can disconnect the battery for however you need to install measuring. Even a couple of amp drain can be powered by a AA 12v pack for ten minutes
|
|
|
|
|
The Following User Says Thank You to Piotrsko For This Useful Post:
|
|
|
05-10-2021, 12:48 PM
|
#6 (permalink)
|
|
Human Environmentalist
Join Date: Aug 2010
Location: Oregon
Posts: 12,810
Thanks: 4,327
Thanked 4,478 Times in 3,443 Posts
|
I used to run a 2nd battery to maintain power to the vehicle while I attach my meter, but this method works pretty darn good, and is the quickest method so far.
|
|
|
|
|
05-11-2021, 11:31 AM
|
#7 (permalink)
|
|
Somewhat crazed
Join Date: Sep 2013
Location: 1826 miles WSW of Normal
Posts: 4,425
Thanks: 540
Thanked 1,205 Times in 1,063 Posts
|
Apparently everything I own write settings to EEPROM, because I can remove the battery for a day or so and not loose settings except time. I have to do a reset on the F250 computer to change data.
|
|
|
|
|
05-11-2021, 12:01 PM
|
#8 (permalink)
|
|
Human Environmentalist
Join Date: Aug 2010
Location: Oregon
Posts: 12,810
Thanks: 4,327
Thanked 4,478 Times in 3,443 Posts
|
It seems modern cars remember things like radio station presets. Pretty sure all of mine reset the trip odometers.
My 2006 Acura requires a separate password for the radio and the nav after it loses power.
The 2012 Prius would lose the EV vs Hybrid miles information after losing power, as well as estimated fuel economy and hence the driving range estimate would be off.
|
|
|
|
|
