easy-rogere Posted October 11, 2013 Share #1 Posted October 11, 2013 I seem to have traced a short to the backup fuse. I am not sure what the purpose of the backup fuse or rather the power of the line the fuse serves. I think it goes to the condenser and the RR. When the bike is off and backup fuse out and condenser disconnected I get a reading of 3.2 volts at the neg pole and neg wire on volt meter accross both. The condenser was bad I am guessing by radio problems and the fact with it connected the volts reading goes up to 12.75. Now when I put in the backup fuse it sparks but does not blow and the volts go back up to 12.75 even with the condenser out. Would it hurt the bike to run it with the backup fuse removed? What would cause a short in the line that the backup serves does it go to something beside the condenser and RR? Thanks for any help with this. Roger Link to comment Share on other sites More sharing options...
etcswjoe Posted October 11, 2013 Share #2 Posted October 11, 2013 It is what holds the memory for your trip and clock settings and I think it also holds the radio station memory. Link to comment Share on other sites More sharing options...
Brake Pad Posted October 11, 2013 Share #3 Posted October 11, 2013 Oh, and disconnect the battery when pulling fuses. Link to comment Share on other sites More sharing options...
dingy Posted October 11, 2013 Share #4 Posted October 11, 2013 Oh, and disconnect the battery when pulling fuses. Why ?? Gary Link to comment Share on other sites More sharing options...
rougeray Posted October 11, 2013 Share #5 Posted October 11, 2013 Never heard of a back up fuse. Where is it located? What size is it? Link to comment Share on other sites More sharing options...
bongobobny Posted October 11, 2013 Share #6 Posted October 11, 2013 And all this time I thought the backup fuse was in case you started going too fast backing up it would blow... Ray, I think it is in the fuse block behind the fake battery cover, 10 amp I think but don't quote me... Link to comment Share on other sites More sharing options...
etcswjoe Posted October 11, 2013 Share #7 Posted October 11, 2013 Never heard of a back up fuse. Where is it located? What size is it? It's 10A located behind the left side cover. Link to comment Share on other sites More sharing options...
rougeray Posted October 11, 2013 Share #8 Posted October 11, 2013 Hmm....I can see no reason the "Backup Fuse" would be needed as the manual states it is for the odometer & clock. Not sure how that ties into the capacitor or R/R. The clock & odometer are located in the instrument cluster. To reset the clock or odometer you use the two buttons labeled RESET & SELECT to the left of the right front speaker. I would be looking in that area. You said you had traced a short to the backup fuse but its not blowing the fuse. Don't follow that. What exactly is the problem? 1. Backup fuse (for odometer and clock) 2. Radiator fan fuse 3. Headlight fuse 4. Signaling system fuse 5. Ignition fuse 6. Spare fuse Link to comment Share on other sites More sharing options...
etcswjoe Posted October 11, 2013 Share #9 Posted October 11, 2013 (edited) I looked at the wiring diagram and it shows it going to the radio, gas gauge(I am guessing this is where it feeds the clock and ODO)CB, it's a red green wire. Edited October 11, 2013 by etcswjoe Link to comment Share on other sites More sharing options...
Brake Pad Posted October 11, 2013 Share #10 Posted October 11, 2013 Why ?? Gary Cause the flux capacitor, losses its time and you can wind up in Deep dodo. Link to comment Share on other sites More sharing options...
MikeWa Posted October 12, 2013 Share #11 Posted October 12, 2013 The 'back up fuse' is the same as 'keep alive' in automotive. There is no internal battery as in your PC or lap top computer. So a separate memory maintainer circuit is used. This keep alive circuit has a separate fuse called the 'back-up' on the Venture. Mike Link to comment Share on other sites More sharing options...
easy-rogere Posted October 12, 2013 Author Share #12 Posted October 12, 2013 Hmm....I can see no reason the "Backup Fuse" would be needed as the manual states it is for the odometer & clock. Not sure how that ties into the capacitor or R/R. The clock & odometer are located in the instrument cluster. To reset the clock or odometer you use the two buttons labeled RESET & SELECT to the left of the right front speaker. I would be looking in that area. You said you had traced a short to the backup fuse but its not blowing the fuse. Don't follow that. What exactly is the problem? 1. Backup fuse (for odometer and clock) 2. Radiator fan fuse 3. Headlight fuse 4. Signaling system fuse 5. Ignition fuse 6. Spare fuse RougerRay I have been trying to find what is causing a continuity reading across the Neg pole and the Neg ground wire of 12.75. With every fuse out and a new RR and the condenser out I got a reading of 3.5 which is what you think to power the memories on the bike. Then connected all the fuses and the 3.5 reading held. When the last fuse (always the last) the backup fuse was put the 12.75 returned. Sooooooo figured what ever was causing the reading had to be somewhere in the backup system. Also the radio fuse was taken out and left out as well. The bike with new RR now charges at 14.3 and with backup fuse out, condenser out and radio fuse out the reading is 3.5 volts so my question was trying to determind if anyone saw any harm to the bike if I rode it like that at least long enough to see if the RR didn't short out or start to charge back down at 13.4 which is were the old RR was doing. I have another condenser comming and when it gets in I will put it on the bike and see if the 3.5 holds if it does then I will add the radio fuse and see if it holds at 3.5 and if those things happen then I would again try the backup fuse back in to see if it stays at 3.5 or goes back up to 12.75 reading. At this stage I am ready to even leave it in and see if it drains the battery or rather the reading is just some kind of electric ghost. Link to comment Share on other sites More sharing options...
Dano Posted October 12, 2013 Share #13 Posted October 12, 2013 Uh, put a DC ammeter in line on that fuse and see if it draws any AMPERAGE That will let you know if there is a load or if it's just a replacement fuse (backup!) Link to comment Share on other sites More sharing options...
Geobob Posted June 16, 2014 Share #14 Posted June 16, 2014 For those still interested, I think the backup fuse might also hold the CB station. Mine always went to channel 9 but think I fixed that by replacing it. Link to comment Share on other sites More sharing options...
adventurer 08 Posted June 17, 2014 Share #15 Posted June 17, 2014 It is what holds the memory for your trip and clock settings and I think it also holds the radio station memory. It is for memory for clock and trip meter. Link to comment Share on other sites More sharing options...
eusa1 Posted June 17, 2014 Share #16 Posted June 17, 2014 cough cough cough...... who blew the dust off this thread?? Link to comment Share on other sites More sharing options...
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