electrical engineering - sort of

[Jeff Saline]

Listers, I've recently noticed a few posts about fuses and suggestions on wiring. Just thought I'd post a few quick comments. Chassis fuses protect the chassis wiring and not the device. A device might have a fuse in it and that fuse is to protect the device. Fuse size should be figured based on the size/gauge of the wiring. The wiring should be based on the load and length of run. General comments suggesting a fuse rating without knowledge of particulars is potentially dangerous to the electrical system. Best, Jeff Saline ABC # 4412 South Dakota Airmarshal Airheads Beemer Club www.airheads.org The Beautiful Black Hills of South Dakota 75 R90/6, 03 KLR650, 79 R100RT . . ____________________________________________________________ 57 Year Old Mom Looks 27! Mom Reveals $5 Wrinkle Trick That Has Angered Doctors! http://thirdpartyoffers.juno.com/TGL3141/4e26edff9af4cde6a1st04vuc

[k650@verizon.net]

Good advise below and I would like to add... Best practice especially if you are powering expensive devices including radio receivers would be to run both the positive and negative lead directly to the battery (in the case of the KLR the opposite end of the large gauge battery cables is OK). This will give you the cleanest power as you want to avoid interference from the ignition and charging systems and also the least chance of voltage drop. You run both leads together and make them into a twisted pair (a twist every few inches or so). This will help avoid the positive lead acting as an antenna and picking up radio frequency interference (RFI). Also it is best to fuse both the positive and negative lead. Electricity takes the path of least resistance. If the vehicle develops a ground problem it is possible (mostly when spinning the starter motor) the ground path could be a reverse loop through your expensive electronic devise. This is why you want to fuse both leads and put those fuses close to the beginning of the circuit at the battery up to but not exceeding the wire capacity. Use another fuse at the devise sized as recommended by the manufacturer. Walt -----Original Message----- From: DSN_KLR650@yahoogroups.com [mailto:DSN_KLR650@yahoogroups.com] On Behalf Of Jeff Saline Sent: Wednesday, July 20, 2011 11:01 To: DSN_klr650@yahoogroups.com Subject: [DSN_KLR650] Electrical Engineering Listers, I've recently noticed a few posts about fuses and suggestions on wiring. Just thought I'd post a few quick comments. Chassis fuses protect the chassis wiring and not the device. A device might have a fuse in it and that fuse is to protect the device. Fuse size should be figured based on the size/gauge of the wiring. The wiring should be based on the load and length of run. General comments suggesting a fuse rating without knowledge of particulars is potentially dangerous to the electrical system. Best, Jeff Saline ABC # 4412 South Dakota Airmarshal Airheads Beemer Club www.airheads.org The Beautiful Black Hills of South Dakota 75 R90/6, 03 KLR650, 79 R100RT .

[spike55_bmw]

"Electricity takes the path of least resistance." I would add that it can happen when welding on a bike or aluminum boats. I had to rewire a few boats. The welder operator clipped on at the back and then moved around the boat with the positive (TIG). Eventually the path of least resistance was through the wiring for the lights and motor control wires. Apparently in a flash be cause there was nothing there except soot under the gunwale and back into the motor cover when the boat came into the shop. Not cheap. Keep the + & - close together when welding on your bike. Don R100, A6F

--- In DSN_KLR650@yahoogroups.com, wrote: > > Good advise below and I would like to add... > Best practice especially if you are powering expensive devices including > radio receivers would be to run both the positive and negative lead directly > to the battery (in the case of the KLR the opposite end of the large gauge > battery cables is OK). This will give you the cleanest power as you want to > avoid interference from the ignition and charging systems and also the least > chance of voltage drop. You run both leads together and make them into a > twisted pair (a twist every few inches or so). This will help avoid the > positive lead acting as an antenna and picking up radio frequency > interference (RFI). Also it is best to fuse both the positive and negative > lead. Electricity takes the path of least resistance. If the vehicle > develops a ground problem it is possible (mostly when spinning the starter > motor) the ground path could be a reverse loop through your expensive > electronic devise. This is why you want to fuse both leads and put those > fuses close to the beginning of the circuit at the battery up to but not > exceeding the wire capacity. Use another fuse at the devise sized as > recommended by the manufacturer. > > Walt > > > > -----Original Message----- > From: DSN_KLR650@yahoogroups.com [mailto:DSN_KLR650@yahoogroups.com] On > Behalf Of Jeff Saline > Sent: Wednesday, July 20, 2011 11:01 > To: DSN_klr650@yahoogroups.com > Subject: [DSN_KLR650] Electrical Engineering > > Listers, > > I've recently noticed a few posts about fuses and suggestions on wiring. > Just thought I'd post a few quick comments. > > Chassis fuses protect the chassis wiring and not the device. A device > might have a fuse in it and that fuse is to protect the device. > > Fuse size should be figured based on the size/gauge of the wiring. The > wiring should be based on the load and length of run. > > General comments suggesting a fuse rating without knowledge of > particulars is potentially dangerous to the electrical system. > > Best, > > Jeff Saline > ABC # 4412 South Dakota Airmarshal > Airheads Beemer Club www.airheads.org > The Beautiful Black Hills of South Dakota > 75 R90/6, 03 KLR650, 79 R100RT > > . >