Webasto wiring into a 300tdi

Wilboro

Well-known member
Hey can anyone point me in the direction of a wiring manual to tie a Webasto TTC into a 300tdi. Specifically looking to figure out how to have it turn on the rovers fans once it's brought the engine up to temp.
 

Priinjp

Member
First a quick introduction as this is my first post on the forum. I do not have a rover yet but I'm looking at that anniversary model and thinking very seriously about picking it up. My experience this point has all been with Land Cruiser's and I currently own a medium wheelbase 3.4 L 1984 BJ 46 which is what I installed my coolant heater in. So I can't give you any specifics but I can't imagine it would be so different than any other installation. Anyway here's what I did.

I ran an Espar in my truck but I'm pretty sure they work similarly. It's by far one of the best mods I've made. I love getting into my truck in the morning and having it be warm and defrosted and ready to go!

The Espar unit has an output to switch a relay for the heater blower when the coolant reaches 30*c. They also sell a Blower Control Module which differs from a simple relay in one important aspect regarding battery life. It incorporates a potentiometer or something similar allowing one to have the cab heater blower running as low as desired- thus increasing battery life. Also it's wired in conjunction with the heater switch. This unit could also be used with the webssto heater as well.

For the time being I've decided to use a SPDT relay wired to switch the power to the heater switch between the original + that requires the key to be in the run position to the cigarette lighter + that operates with the key in the ACC position.

With the key in the ACC position and the heater switch is on (either high or low) when the coolant reaches 30*c the relay will be activated by the Espar, closing the normally open position and suppling power to the blower via the lighter circuit. When I start the car and the key is on the run position the blower system will return to the original circuit (NC position on the relay.)

Of course this requires the key to be in the ignition however it would be just as easy to use power from an unswitched source. I'm just using that circuit because it's available and already fused.

Hope this helps a bit.


Pete
 

RDavisinVA

Technical Excellence Contributor
Pete:
Welcome to the forum.
Thanks for the informative post... very good for a newly welcomed member!

Am in the planning stages of the 110 Dormobile Camper and while we are going to use an Airtop the need for auxiliary power is shared.

Instead of drawing power from a single battery, there are a lot of small 12V GMT Deep cycle batteries that will fit the unused space in the battery box under the left seat.
We installed several of these to run various things, but these batteries can be discharged and recharged many many more times than a standard car battery.
We used two 200 AMP relays to direct the alternator output between the two batteries as well as a relay to connect the field wire.

Then you can run off the auxiliary battery for things like the heater blower.

Sonic Electronicx has a very good selection of small GMT batteries.

https://www.sonicelectronix.com/cat_i228_car-batteries-power-cells.html

You can match up the space available for the auxiliary battery and the amount of 12V power your application requires.

There are other suppliers as well, but Sonic usually has the best pricing.

Hope this helps Wilboro.
 

Jrose609

Well-known member
Pete:
Welcome to the forum.
Thanks for the informative post... very good for a newly welcomed member!

Am in the planning stages of the 110 Dormobile Camper and while we are going to use an Airtop the need for auxiliary power is shared.

Instead of drawing power from a single battery, there are a lot of small 12V GMT Deep cycle batteries that will fit the unused space in the battery box under the left seat.
We installed several of these to run various things, but these batteries can be discharged and recharged many many more times than a standard car battery.
We used two 200 AMP relays to direct the alternator output between the two batteries as well as a relay to connect the field wire.

Then you can run off the auxiliary battery for things like the heater blower.

Sonic Electronicx has a very good selection of small GMT batteries.

https://www.sonicelectronix.com/cat_i228_car-batteries-power-cells.html

You can match up the space available for the auxiliary battery and the amount of 12V power your application requires.

There are other suppliers as well, but Sonic usually has the best pricing.

Hope this helps Wilboro.
Robert, great idea. Thanks for the link for the battery.
 

Priinjp

Member
Thanks Chris! I just went to this process right myself so I'm very happy to share.

I thought I'd also point out that since I couldn't add an isolated battery I switched my starter battery over to an AGM type because they supposedly handle being discharged and recharged better than your common starter battery. Also the Espar has a setting that automatically shuts the system down if the battery voltage drops below a programmed set point. I imagine the webasto will as well. Since I camp solo in the winters I also carry a lithium jump starter battery just in case.


Pete
 

RDavisinVA

Technical Excellence Contributor
Also the Espar has a setting that automatically shuts the system down if the battery voltage drops below a programmed set point. I imagine the webasto will as well. Since I camp solo in the winters I also carry a lithium jump starter battery just in case.

There are stand alone battery protectors like the Havis ChargeGuard for example for anyone connecting auxiliary electrical equipment that does not have a protector built into their equipment.

http://www.havis.com/catalog/Auto_Shut_Off_Timers-923-1.html

While it was designed for mobile work force electronic equipment, it can protect a battery and be programmed to do things like leave equipment running for a predefined (programmed by a micro-switch) time if desired.
I plan to use one to run the airtop for 15 minutes after you turn in to keep the camper warm.
 
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