Another Charging Issue
I;ve done a lot of reading on the site regarding my issue, which is that after one or two cummutes (about 80 miles RT) the battery is drained. I replaced my MF Yusa last year with a gel battery from Deka and had that battery tested (battery is good) this year after the issue started. The current R/R is the original unit which I relocated after 15-18K miles. All but about 9K miles on the bike were put on while using a MF battery. I am leaning toward replacing the R/R with a new mosfet version as discussed elsehwere in the forum. However, I would love any additional input the group can provide before I make the purchase. Here is what I have checked thus far:
Voltage at the battery terminal when the bike is warmed up and running ranges from 12.5 - 13.5, does not reach 14V @ 4000 rpm, struggles to get there @ 5,000 RPM, > 14 is out of the question.
I disconnected the R/R and tested the various combinations of B,M,G,A1,A2, & A3 connections using a digital Fluke multi-meter. There are several readings that are not in spec, for example none of the B (neg lead) connections = affinity. The B -M & B-G read around 3.5 M ohms and the B - A results are in the 1.8M ohm range. Many others are way off. All of the terminals were wire brushed with a dremel tool before testing.
These where done on a cold stator as the battery is currently being charged:
All yellow to yellow wire readings are between .4 - .5 ohms (in spec).
All yellow to chasis-ground readings registered affinity (in spec).
Pretty sure this has no bearing but since I am not an expert I will mention that I have a slow oil leak coming from the stator plug area. If I get lucky and do not need to replace the stator, I was planning on using some high temp (Copper) gasket maker compound to seal around the plug.
Any input is greatly appreciated as is all of the great knowledge already shared by this group.
MAG659 - Mark George
Chagrin Falls, OH
1986 VN 750 - "Old Goat"
MFB (Deka- AGM)
NKG - Iridiums
Avon Venoms - wider
K&N Air Filters
Last edited by mag659; 04-19-2011 at 01:27 AM.