Join Date: Apr 2007
Location: Oxnard, CA, USA
Your best bet is to get an auxiliary fuse box, especially if you plan on adding anything else later (intercom, lights, heated gear, iPod, etc.) This would use a relay to trigger the fuse block, and everything attached to it.
How you want things to turn On/Off will specify where you tap into the bike at for the relay trigger wire. Here are your options:
On all the time - direct to battery.
On with the key and Off ~60 seconds after the key - use the Red/White wire from the GPS accessory plug, located up in front of the battery.
On with the key and Off with the key - use either the extra power socket on the left side of the bike, or the parking light up near the headlight (for which there is a plug & play harness available).
On when the engine starts (as opposed to when the key is turned on) and Off with the key - use the Low Beam light feed, although this does require splicing in to the existing wiring.
Most GPS units draw very little power, so you might still be able to wire it directly to one of the above options without any CanBus issues.
'13 Dark Graphite Metallic K16GTLD, 24K miles and counting...
'09 Magnesium Beige Metallic K13GT, 60K miles miles and counting...
'02 Mauve Metallic K12LTC, 106K miles and sold
BMWLT#145, IBA# 366, MOA# 111996, SCMA# 24032
All lower 48 states plus Alaska on the K13GT in two weeks . . .
Some people see the gas tank as half empty. Some see it as half full. All I care is that I know where the next tankful is coming from...