1
Testing Temperature Switching Relay Wed Mar 10, 2010 11:09 am
Loner0831
![avatar](https://i.servimg.com/u/f41/11/71/56/74/avatar10.jpg)
active member
![active member active member](https://i.servimg.com/u/f80/11/71/56/74/bmw-1s10.gif)
Here's a simple one for our experts here. My bike is a 1987 K100 RT that's been stored for several years due to some undiagnosed malfunction by a previous owner. I have traced the problems to at least two areas. First it has a faulty fuel pump, and I will purchase an appropriate substitute as discussed in other areas of this forum. For the second suspect problem, however, I need a touch of advice. I am reasonably sure the Temperature Relay is faulty. Pin #45 has 12v+ with the switch on. If I jump 12v+ to Pin #A2 the fan operates. If I jump a ground (12v-) to Pin #A3 I get the indicator light as it should. If I ground Pin #E, I get nothing (should power fan and indicator light as I understand it). That last test indicates a faulty relay, right?
Also, if the Temperature Relay works properly, when it has 12v+ applied to Pin #45, and it is properly grounded through the ground pin, should I see 12v+ going out Pin #9 to the FI relay (which would also send powere to the fuel pump)? I have the diagrams available on this tech forum, but can't quite make out the complete power flow in this relay.
Thanks in advance for your help!![Testing Temperature Switching Relay Icon_smile](https://2img.net/i/fa/i/smiles/icon_smile.gif)
Also, if the Temperature Relay works properly, when it has 12v+ applied to Pin #45, and it is properly grounded through the ground pin, should I see 12v+ going out Pin #9 to the FI relay (which would also send powere to the fuel pump)? I have the diagrams available on this tech forum, but can't quite make out the complete power flow in this relay.
Thanks in advance for your help!
![Testing Temperature Switching Relay Icon_smile](https://2img.net/i/fa/i/smiles/icon_smile.gif)