Author Topic: Parasitic draw of power in my '62...  (Read 605 times)

Offline 62 CDV

  • Posts: 27
  • CLC Number: 15457
  • Name: E Kenny
Parasitic draw of power in my '62...
« on: May 10, 2019, 12:26:48 PM »
Today I located the source of a parasitic draw of electricity in my '62 by pulling fuses when the car was fully shut off. (This includes blocking the door lamp switch to the OFF position). While pulling fuses one by one and then returning them back to normal, I saw the power draw drop from 220 milliamps to almost zero when I pulled the BODY FWD fuse.

Which circuits are controlled by the BODY FWD fuse? I'm betting that it won't be easy to trace them, but I want to trace the correct circuits and not mess up anything else.

Thanks in advance for the due diligence.

Offline Dan LeBlanc

  • Posts: 4813
  • Name: Dan LeBlanc
Re: Parasitic draw of power in my '62...
« Reply #1 on: May 10, 2019, 12:33:16 PM »
 Power windows and seats for sure.

Its actually BODY FD (short for feed) 
Dan LeBlanc
1977 Lincoln Continental Town Car

Offline Eric DeVirgilis CLC# 8621

  • Posts: 7039
  • Name: Eric DeVirgilis
Re: Parasitic draw of power in my '62...
« Reply #2 on: May 10, 2019, 12:34:53 PM »
A Cadillac Motorcar is a Possession for which there is no Acceptable Substitute

Offline Dan LeBlanc

  • Posts: 4813
  • Name: Dan LeBlanc
Re: Parasitic draw of power in my '62...
« Reply #3 on: May 10, 2019, 12:37:57 PM »
If you don't have anything hooked in the adjacent accessory terminal, you can move the connector and circuit breaker to that side and then when the key is off, that circuit will have no power until you isolate the problem.

It just means you can only use the windows and seats when the key is in the accessory or run position.
Dan LeBlanc
1977 Lincoln Continental Town Car

Offline bcroe

  • Posts: 3895
Parasitic draw of power in my '62...
« Reply #4 on: May 10, 2019, 03:36:34 PM »
Today I located the source of a parasitic draw of electricity in my '62 by pulling fuses when the car was fully shut off. (This includes blocking the door lamp switch to the OFF position). While pulling fuses one by one and then returning them back to normal, I saw the power draw drop from 220 milliamps to almost zero when I pulled the BODY FWD fuse.

Which circuits are controlled by the BODY FWD fuse? I'm betting that it won't be easy to trace them, but I want to trace the correct circuits and not mess up anything else.

You need to get a detailed drawing of the car wiring.  Then you can continue your
process of disconnecting wires.  I doubt it is windows or seat, has anything been
added to the car that might have a drain?  Bruce Roe

Offline Cadillac Fleetwood

  • Posts: 919
  • Name: Charles Fares - Sadly Deceased Mid November 2021
Re: Parasitic draw of power in my '62...
« Reply #5 on: May 10, 2019, 03:39:56 PM »
Interior courtesy lights, glove box light, trunk light, and cigarette lighters are also on that circuit.

-Charles Fares
Forty-Five Years of Continuous Cadillac Ownership
1970 Fleetwood Brougham
1969 DeVille Convertible
1989 Fleetwood

"The splendor of the most special occasion is rivaled only by the pleasure of journeying there in a Cadillac"

Offline bcroe

  • Posts: 3895
Parasitic draw of power in my '62...
« Reply #6 on: May 10, 2019, 04:45:19 PM »
My wild guess is the glove box light is stuck on.  Bruce Roe

Offline arch62

  • Posts: 90
  • Name: P. Paraskis
Re: Parasitic draw of power in my '62...
« Reply #7 on: May 10, 2019, 06:13:30 PM »
Not a wild guess. It happened to me, so I now placed a 1"x1" balsa wood piece to keep the plunger back. It would push through the vinyl before.

Offline fishnjim

  • Posts: 2431
  • Name: J. Bozin
Re: Parasitic draw of power in my '62...
« Reply #8 on: May 10, 2019, 09:21:34 PM »
You would benefit from having a low range amp clamp ammeter and check all the wires in that circuit for the one(s) drawing amps.   
A glove box light is around 3W.(typical 1891)   In a 12 V circuit it will pull 0.25 A or 250 milliamps, so that's a valid lead(or other 3W users) to run down from your measurement .
The other thing is to check for hot spots.   V=IR , 12=.25R, R= 48 ohm of resistance, should heat up a tad, due to corrosion, etc if not a light but leakage.   IR non-contact thermometers are pretty cheap these days.   {I warn about this old wiring corrosion, as left alone, it can flame up.}

Offline TJ Hopland

  • Posts: 10188
Re: Parasitic draw of power in my '62...
« Reply #9 on: May 11, 2019, 08:46:15 AM »
Know of anything that isn't working?  Especially something run by a relay?   Run into it before where at some point in a cars life something went wrong causing a relay to always operate so the fix was disconnect what ever the relay was running instead of soling the actual issue.    This left the relay still always on and drawing power as well as something not working like say a direction of the seat?
StPaul/Mpls, MN USA

73 Eldo convert w/FiTech EFI
80 Eldo Diesel
90 CDV
And other assorted stuff I keep buying for some reason

Offline V63

  • Posts: 1410
  • Name: W Link
Re: Parasitic draw of power in my '62...
« Reply #10 on: May 11, 2019, 07:22:20 PM »
Check the recesses of the lighter sockets for foreign conductives? 

Offline 62 CDV

  • Posts: 27
  • CLC Number: 15457
  • Name: E Kenny
Re: Parasitic draw of power in my '62...
« Reply #11 on: May 17, 2019, 08:10:45 PM »
At long last, I found the source of the parasitic draw of power. It was located in the glove compartment light bulb. When I pulled the bulb, the power draw went from 220 milliamps to zero. (Maybe I should get a different bulb?).

I now can tell you that things like the power seats, power windows and clock are NOT part of the BODY FD circuit (at least they're not in my car). They all were operable after I pulled the fuse.  I'm guessing that it's just the interior lights and cigarette lighters that are fed from that fuse.

THANK YOU FOLKS FOR ALL YOUR HELP HERE. I do appreciate it.


 

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