Thread: HELP! Wiring for screen heater

Rob, there's no need to skimp on the photos!

Can you post some bigger ones as well as one of the back of the unit where the switch is?

Trying to get them bigger...photobucket is not compling Will have to take some photos and post them up

can you email them to me?

Finally got some photo's apologys for the poor quality.

This is what the unit looks like:



This is the unit opened up :



This is the switch and heater element:


The switch:


another one:



and finally this is ATTACK CAT wanting to know what the hell I am doing, the mongrel bit me just after I took this

Rob, I'd suggest, that, as you thought, the second wire went off to the other heater element on the other screen.

I assume the other end of the element has a wire to go to earth? If not, then each unit will need one.

While you could take the wires straight back to the battery via a fuse, this could allow it to be operating (and flattening the battery) when the engine isn't running.

I think it would be better to wire it thus:

+ve battery -------> fuse ----> relay terminal 30 ---- relay terminal 87 -----> switch ----> element ----> earth.

+ve IGN -----> (second) switch ----> relay terminal 86 ---- relay terminal 85 -----> earth

Why this way? It won't work unless the ignition is on, preferably engine running. The second switch will isolate the relay when not needed.

This diagram (for a lighting circuit) is similar.



If I could think of a simple way to do it, I'd only have it operational when the engine is running. Actually, there is. One can use the oil pressure switch to control the relay as well. No oil pressure and the units won't turn on.

it looks as though the other end of the element will earth via the mounting screw.......
so it will just need a power feed to the wire where the switch is......



and as ron said.......use a fused feed........

Thats is my thinking too Zook, the element ends in a ring which fits over the retaining /fixing screw which then goes into a distance piece, to keep the back and the front apart, the front then screws on into this post. My thinking was that there is only one power line into a unit, say the drivers side, this is then directed across to the second unit on the passengers side. Each unit is activated by its own switch. Earth is achieved via the screw at which the element ends.

Ron ! thanks for your considered input. Will have to do some under dash study.

Not sure how effective the whole shebang is going to be, but will look really 'cool' and that is the main thing. Not 'cool' to look uncool

Thanks fellas!

cool.....?



if it works......it should be HOT......!!