Anyone here any good with Eberspacher heaters?

Hi everyone. Ive got a used Eberspacher D2 heater, probably from a Transit. The guy i bought it off did show me it working but ive completely forgotten how he wired it up for me. He had it going off a car battery with the pump drawing fuel from a 5l can, so I know its not rocket science to get it going.

The wiring for the control panel has been cut and shut so im not too bothered about any of that as I dont need to change it. The bare wires im left with however are:

A thick red wire.
A thick brown wire.
A thin brown wire.
A thin green wire with a red trace.
These are all going straight to the heater, with the exception of the thin red wire which goes to an 8 pin plug.

Also, i have a Ford 2 pin connector for the pump. This has a brown and yellow wire and a red and black wire. These wires may be completely unrelated to the Eber' but cant be sure.

Does anyone here know where all these wires should be going? I can probably guess but I dont want to damage anything and im struggling to find good information online. If anyone knows of any, id be happy to know about it.

Did you get a controller board?

if you mean the 2" square LCD screen with five rubber buttons on it. Yes. I did.

jimllshiftit said:

if you mean the 2" square LCD screen with five rubber buttons on it. Yes. I did.

Click to expand...

Quick look at mine & it’s an early version.

mine just has live/earth to battery
Pump fed from control unit.mine Does have relays involved for start up/shutdown.

Thanks. Theres no relays on this and no fuses either. Has yours got any fuses in it? I think I can figure this out but im tempted to stick a 40 amp fuse on the fat red wire to the battery. What do you reckon? too much? too little?

This any good

Thanks for that. I watched it a few times but it assumes that your pump plugs straight into the loom, which in my case it does not. It is a useful video though.

Ive got power to the control board and ive got the fan spinning but I cant get the pump to bleed at the moment. All it does is "click,click,click" with no fuel coming through and cold air coming out of the unit. I havent really figured out what all the buttons do yet, either. Its the old type with five rubber buttons and a 2" x 1" Mon Tue Wed Thu Fri Sat Sun LCD screen on it. I am getting there though.

jimllshiftit said:

Thanks for that. I watched it a few times but it assumes that your pump plugs straight into the loom, which in my case it does not. It is a useful video though.

Ive got power to the control board and ive got the fan spinning but I cant get the pump to bleed at the moment. All it does is "click,click,click" with no fuel coming through and cold air coming out of the unit. I havent really figured out what all the buttons do yet, either. Its the old type with five rubber buttons and a 2" x 1" Mon Tue Wed Thu Fri Sat Sun LCD screen on it. I am getting there though.

Click to expand...

I've only worked on the Webasto but I'd assume the pumps work in the same way. In which case the click will be correct as it is a pulse type i.e. small pulses.
The pump I would assume is controlled by the heater as it needs to vary the amount of fuel depending on heat setting.

I used the vacuum from a syringe to pull the diesel through the pump. Once diesel spits out connect the pipe (from the heater) & suck again till it is ready to conect to the heater.
If no diesel at the heater it won’t run.

While you two were writing those very informative posts, I seem to have cracked it myself.

The wiring is dead easy. Ive put the fat and the thin red wires together and put a 30 amp fuse on those, at the positive end of the battery. The brown wire speaks for itself and just goes to the negative of the battery.

The pump was just being a pig to prime. It only works in one direction and polarity doesnt seem to matter. The pumping direction is clearly indicated on the body of the pump which is then completely obscured by the very tightly fitting "anti vibe" rubber mount...... so until I found the arrow, i had the bloomin' thing pumping backwards! With that rectified, i put the pump at a sharper angle, put a small fuel container above the pump, thereby allowing gravity to give me and the pump a helping hand, and then tapped the pump terminal on a battery about 1000 times or so until fuel started to spit out the end of the pipe. Heater is now up and running although I need to get to grips with the controls.

Does the control box have a thermostat in it or something? Will it just come on when the temperature drops below a certain point?

jimllshiftit said:

While you two were writing those very informative posts, I seem to have cracked it myself.

The wiring is dead easy. Ive put the fat and the thin red wires together and put a 30 amp fuse on those, at the positive end of the battery. The brown wire speaks for itself and just goes to the negative of the battery.

The pump was just being a pig to prime. It only works in one direction and polarity doesnt seem to matter. The pumping direction is clearly indicated on the body of the pump which is then completely obscured by the very tightly fitting "anti vibe" rubber mount...... so until I found the arrow, i had the bloomin' thing pumping backwards! With that rectified, i put the pump at a sharper angle, put a small fuel container above the pump, thereby allowing gravity to give me and the pump a helping hand, and then tapped the pump terminal on a battery about 1000 times or so until fuel started to spit out the end of the pipe. Heater is now up and running although I need to get to grips with the controls.

Does the control box have a thermostat in it or something? Will it just come on when the temperature drops below a certain point?

Click to expand...

horse box has a central heating type thermostat (big dial)
When it gets to temperature it just shuts down( (does the cool down process)

then cycles once the temp drops.

now my daily lorry (electronic) is set to 16’ in the winter & cycles all night. Loverly on a frosty morning

you might be able to program this to remote start

Its an old LCD controller and the days of the week on it suggest that I can set the thing kick in when I want it to. I just couldn't work out how it knows what the temperature is. Ill work it out in the morning, im sure.

Thanks for your help.

jimllshiftit said:

The wiring is dead easy. Ive put the fat and the thin red wires together and put a 30 amp fuse on those

Click to expand...

A little googling revealed 20amp for the thick wire, and 5amp for the thin. 30amp IMO possible to melt the thin wire and give you max heating as it goes up in flames

backinblack said:

A little googling revealed 20amp for the thick wire, and 5amp for the thin. 30amp IMO possible to melt the thin wire and give you max heating as it goes up in flames

Click to expand...

Sincere thanks. Electrics are not my strong point but the day we stop learning is the day we start dying.