not sure if I am on the right forum or not? I have a 90 740 with the wires burnt where it connects to the radio suppression relay and also a burnt spot on the back of the relay , and burnt on inside of connector with loose connections. Will this cause a no start and a cold start code?
Before it was stalling and was getting hard to start. The wires in the connector may not have good connection either. If I get some replacement wires to the connector (bullet pigtails) , I noticed that the wire are two colors , would it hurt to put some solid color wire to hook up to them? I have replaced the Timing Belt earlier.

 

if power isn't getting through the RSR to the injectors, then it won't run.

using different color wires could cause some confusion for a future mechanic, but as long as they are adequate gauge wires, connected properly, it should work.

those wires and relay being burnt suggests there was or is a short to ground somewhere.

 

Thanks for the reply, What gauge of wire is used for this connection?

 

(I moved this to its own thread, since it really didn't have much to do with that other thread).

the wiring is metric, of course, so will be measured in millimeters squared. I'm not sure the gauge, I'd measure the conductor with a dial caliber and look it up. the signal wires to the relay coil (pins 1 and 2) are probably like 0.75mm2 but the switched power wires are probably 1.0 or 1.5 mm2. you can use 18 AWG instead of 0.75mm, 16 awg for 1.0 and 14 awg for 1.5 mm

when you measure the conductor, 0.75mm2 wire is about 0.039", 1.0 is around 0.05", and 1.5 is about 0.063" in diameter

 

to measure the wire , do you measure the outside of insulation? I measured a couple of wires with dial calipers and it measured .093" , something does not seem right according to your numbers

 

no, you measure the conductor, thats the metal inside the insulation. make sure its still round where you measure it as stranded wire can get flattened.