i take it its nothing to do with the 100 ohm resistor? making it lower wouldnt do anything would it?
No, so long as your resistor is between pin 8 - pin 16. This has no effect on the RGB signals. It just tells the TV to expect RGB input.
ive took another cable apart , what do i do with the rgb return wires?
i take it these are grounds? so would i just connect them all together to video ground? or do i just disreguard them?
where do i connect the shield wire to?
RGB 'returns' are indeed grounds and must be connected to ground. Twist all the grounds together (ie VGA 6,7,8,10,+shield), and solder them to a convenient ground pin on the male SCART, such as blue ground (SCART 5) or even audio ground (SCART 4). This includes the VGA cable's shield wire. If these grounds aren't connected, then this could account for your colour problems.
(Make sure that you *don't* hook any of the VGA monitor ID wires to ground - ie VGA pins 11,12,15 - just snip them off).
If you hook up your VGA cable to the AVGA card and use a multimeter diode test on the various ground wires (while the PC is turned off, of course), then you'll find that all the grounds are connected (common) at the AVGA card anyway. On most TVs, all the SCART grounds are connected as well. With this bit of insight, you'll realise that you can simply twist all the VGA grounds together and connect to a single ground pin on the SCART.
It occurs to me that if you take blue from green, then you get yellow. This might give you some insight as to why your reds appear yellow. I still think that you are looking at something wrong with your wiring connections.
do i need to add resistors in line with the rgb as ive read in a previous post in this section or is it ok to try without these
No need for resistors on RGB signals unless you are connecting up a JPAC to the TV, which is a bit of a waste of effort. JPACs amplify the signal, making it too high for SCART TV standards (potentially damaging the TV). So you would need to lower it again, therefore the need for a resistor. I've actually done this before very successfully in a couple of special cabinets with SCART input monitors to allow them to accept JAMMA standard PCBs, but this was a special case. However, note that Andy of Ultimarc does not personally recommend using JPACs like this, and there is simply no need for you to hook up a JPAC to your TV.
the new cable i used was female so i could attach to the male (scart part)
i soldered the rgb,comp sync to the parts on the jamma connector, plugged the m & f together, put lead from avga to jpac.
I don't really understand what you've done here or why .... just stick to a simple male VGA -> male SCART cable, and you should be fine. Make sure that you connect all the grounds.