Parasitic draw -- rear defoster??

monkeyodeath · 02-10-2016, 07:53 PM

I recently rehabbed the rear heater fan in my 3.2. The morning after I reinstalled it, the battery was dead.

I found a parasitic draw of more than 2A (!) that went away when I pulled the rear defroster fuse -- the bottom one in the rear fuse compartment.

I'm a little baffled as to how this happened and what I can do to fix it. Anyone else have this problem before?

timmy2 · timmy2's Garage

Reinstall the fuse and try pulling the relay, might be stuck on backwards.

WinRice · 02-11-2016, 06:52 PM

Make sure the plug to the rear defroster relay isn't reversed, it's easy to do. BTDT And it causes a current drain.

monkeyodeath · 02-12-2016, 03:56 PM

Looks like I did exactly that, reversed the relay. Thanks for the heads-up! That thing consumes a lot of current.

juanbenae · juanbenae's Garage

dam you, I thought you were talking about my X.... she was a frosted parasitic draw emotionally & financially. but never mind, carry on.. im cool with this...

SoCalSK8r · 02-12-2016, 06:49 PM

Quote:

Originally Posted by car 311

dam you, I thought you were talking about my X.... she was a frosted parasitic draw emotionally & financially. but never mind, carry on.. im cool with this...

Awesome

Sent from my iPhone using Tapatalk

WinRice · 02-13-2016, 09:15 AM

Quote:

Originally Posted by monkeyodeath

Looks like I did exactly that, reversed the relay. Thanks for the heads-up! That thing consumes a lot of current.

Yep....after my re-wire I checked for resistance across ground to +12 at the battery before hooking up the battery. Had a few ohms until I pulled the fuse to the rear heater. After careful checking of the wiring found the plug on backwards, even though it has a notch, it's still possible to flip it.

Bob Kontak · Bob Kontak's Garage

Quote:

Originally Posted by car 311

a frosted parasitic draw emotionally & financially.

+1

We have common ground. The same ex-wife.

juanbenae · juanbenae's Garage

Quote:

Originally Posted by SoCalSK8r

Awesome

Sent from my iPhone using Tapatalk

I just ordered a pizza that will be delivered to me... it's not gluten free, will have bacon, pepperoni, is warm & no debate prior to calling it in... best pizza ever.