Jayman

I thought that's what you meant mike. Cheers to all for your replies. Just as an experiment I'm trying to make my own control board for my spare heater using an micro controller, some servo controllers and some other bits. May be a cheap fix, will probably just blow it up. I have information regarding voltages, pump frequency and sensor resistance. If it works perfectly I will probably post it somewhere. anyway thanks again. Jay

Cheers mike, I've read about 5 diferent manuals cover to cover. I forgot to say I had already tested the pumps from both heaters. So just to get what you wrote straight, the unit you have is straight from a rover 75, no modifications? the voltage drop across pin 3 and earth should be cycling between 0 and 12V? I'm not sure it will be the glow plug as on both heaters the fuel pump does not operate at all when I try to start the system and like I said the pump voltage is a contant 8.9 volts, no clicking. Hey, If I get enough thad don't work surely I couuld cobble something together. maybe not a heater, possibly some sort of modern art, the concept of the art being the irony of the sale of this broken heater art paying for a working heater.

I am using a vehicle heater because it cost a tenner, if you can provide me with a full marine kit for even ten times that I would snap it up, but somehow I feel that its not going to happen. I have very little money to spend, but I have plenty of time and marine engineering experience. Its just a case of using what I've got.

Ah, I was hoping I would not need to buy a new board. There's no work around for this then? I can easily get more bits of rover, I just don't wan't half a car cluttering my space up.

I pulled a webasto thermo top z/c out of a Rover 75 with the hope of using it for heating and hot water. (I can't afford the genuine marine version). It has the water pump attached so it should be the same as the thermo top C hardware-wise. The problem I'm having is that once I've wired it up the combustion fan and water pump start then after about a minute the combustion fan stops then a little while later the water pump stops, the fuel pump doesn't run at all. I put a light in place of the fuel pump and it stayed dimly lit constantly so it is an electrical problem not a fuel pump problem. The voltage across the fuel pump is about 8.9V, the voltage across the whole unit is 12.8V. I have tried with two different heaters with two different looms and pumps. I have tried the connection from the power switch going into connection 1 and connection 3 as two different official webasto wiring diagrams had these two separate set ups. My thought is that there must be something rover 75 specific about these heaters that I haven't figured out yet any replies would be much apreciated Jay