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[QUOTE=1911XD;854497]Check the 2nd scematic down on this link, it is a great pdf. Both F1 & F7 link to the load relief relay. F7 was empty on my bike because that is the fuse for the factory grip heaters. I located the factory wiring harness for the grip heaters and utilized F7. No wires were shorted.
[url]http://www.bmwgsclub.nl/schematics/R1100GS%20Schematics.pdf[/url]
The horn and load relay are the same. I used the horn relay to test the load relay slot and everything worked as advertised.
[url]http://micapeak.com/bmw/gs/gs11fuse.htm[/url][/QUOTE]
The schematic on the link is a bit unclear but following it or the BMW drawings I have show that F1, F7 and the load relief relay have a common connection to the switch. However the common connection is on the battery side not the load side of the fuses so a bad load relief relay won't overload F1 or F7.
This might be a bit clearer on this drawing: [URL="http://www.mac-pac.org/wp-content/uploads/2011/01/R1100RT_Elec_Diagram.pdf"]http://www.mac-pac.org/wp-content/uploads/2011/01/R1100RT_Elec_Diagram.pdf[/URL]. Although it is for the 1100RT, the wiring is the same for those circuits.
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Here is a link to a R1150RT ladder diagram of the electrical system which makes trouble shooting a lot easier.
[url]http://www.mac-pac.org/tech/electrical-diagrams/[/url]
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[QUOTE=Roger 04 RT;854832]The schematic on the link is a bit unclear but following it or the BMW drawings I have show that F1, F7 and the load relief relay have a common connection to the switch. However the common connection is on the battery side not the load side of the fuses so a bad load relief relay won't overload F1 or F7.
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I don't know what to tell you... But after replacing the relay everything works :thumb
Honestly I didn't expect a relay to fix it but I had torn it down to the smallest bit- minus the bulk of the harness. Everything forward of the connectors under the tank was disassembled to include the grip controls down to the switches and I could find ZERO signs of a short or overheating.
I used a mirror and flashlight and everything in the fuse panel looked good so I was at my whits end :scratch. So I tried the relay and I struck pay dirt. :dunno
I rode it to work today and thoroughly enjoyed the grip warmers! It's a 70 mile round trip and she purrs like a kitten.
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I'm probably missing something because electrical interactions can be complex. My reason for pressing you on this is just in case you get a problem again.
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[QUOTE=Roger 04 RT;855370]I'm probably missing something because electrical interactions can be complex. My reason for pressing you on this is just in case you get a problem again.[/QUOTE]
No problem, I have been trying to figure out why too. Why would adding the grip heaters blow a relay that was and is still in the same circuit?
Was the relay just about ready to check out and the added current just finished it off? I have no idea, that's why I am an aircraft mechanic and not avionics :whistle
