I figured I would post my heater setup, its a harbor freight trickle/float charger, and a harbor freight extension cord/3 way splitter, plus the factory block heater.

I put it where it is for two reasons; it was easier than routing it around up to the front; and it puts it up where it is easy to get to for plugging/unplugging it. For some people this is a big deal not having to bend over to unplug it, so that is a big consideration.

Plus, you won't forget about it before driving off.

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http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

Interesting, now you only need an auto-kickout plug on the fender like on the fire trucks. Or better yet, the design idea I had but haven't built yet:

Second battery, connected to a 500 watt inverter, into a timer, connected to the block heater. The battery would charge from the alternator, but not discharge when connected through an RV battery isolator diode, so the starting battery never gets drained.

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Proud supporting vendor of LOST Jeeps
TRAVELING CRD TECH. I come to you!
Need help? Just ask! I've taken it apart more than most.
Email jeep [at] maincomputer [dot] com - BOARD MESSAGING IS BROKEN
Over 225 CRDs currently driving with my valves, timing belt, rockers, or ARP Studs.
Bad noises = REALLY bad things.

Might be coming to an end down in the flat land, but up here, it is still going strong. Got snow last night.

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2006 Sport CRD

Could the Aztecs have known, that in 2012 after a 4 year experiment, our country would cease to exist?

Most isolator set-ups are not really isolating the starter battery completely since it still shares a common ground with the secondary battery. A difference of potential is going to make those electrons seek balance in the force.

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2006 CRD http://www.UtahPowderCoatings.com/ http://www.gorecon.com/ I'm kind of a big deal.
RL rear bumper, ARB front bumper, Mile Marker winch, Power Tank, Skids by Mopar & Skid Row, RL Super Skink Sliders, 235/85R16 MTR, Air Flow Snorkel, DTT, 4.10 gears, Frankenlift II, Katskin leather, JL Audio stereo, Rosen video.

Obi Wan kenobi taught you well.

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http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

Ummm, no.

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Matt B.

05 Limited CRD. Bought it new. 112k on the clock now.

GDE Eco-tune, rear differential drain plug (drilled and tapped the pumpkin), transmission pan drain plug, Fumoto oil valve, fuel filler neck restriction removed, front hitch, Hayden fan clutch, Sears P1 battery since 08, Mobil 1 5w40, 5 volt glow plugs, DIY timing belt at 109k

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http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

yes they will..

all diodes have a reverse current..but I think the battery will self discharge faster.

yes.. most reverse currents are in the microamp range..or less.

-dkenny

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84 BB school bus, DD8.2L turbo ->the transmission died..too expensive to fix..it'll be heading to the scrap yard..4/11)..Bus gone to Scarp 8/23/11
06 Liberty CRD
'99 dodge ram 2500 quad cab, 4x4, 24v
all Biodiesel powered when its warm enough

The "no" was in response to the earlier statement that the batteries would equalize merely from having a common ground. One wire doth not a circuit make.

Properly isolating batteries does not require isolating their grounds.

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Matt B.

05 Limited CRD. Bought it new. 112k on the clock now.

GDE Eco-tune, rear differential drain plug (drilled and tapped the pumpkin), transmission pan drain plug, Fumoto oil valve, fuel filler neck restriction removed, front hitch, Hayden fan clutch, Sears P1 battery since 08, Mobil 1 5w40, 5 volt glow plugs, DIY timing belt at 109k