Join Date: Jul 2019
Location: San Diego
Year/Make/Model: 2006 Nomad
I have used three different batteries on this bike so far, actually four now that I'm thinking of it. First one was the battery I got with the bike, unknown age but it cranked over the bike fine. I will consider that battery not to be great, even though it charges to 12.6 VDC and cranks the bike over fine for several attempts.
Second battery was a lithium that I have here in the garage, it's smaller dimensions but has more CCA than the stock battery. I have used this battery to start my buddies Harley, it's quite powerful and is in good condition.
Third battery was a mistaken order, I ordered a YTX 16 BS-1 but it has incorrect posts for the Vulcan. I still charged it and tried to use it, same thing happened with that battery. I sold it to a friend after ordering the current battery
This battery is a newly purchased Yuasa YTX20CH-BS that I filled and charged as per their recommendations.
I'm pretty sure it's not a battery problem.
The battery had 13.08 VDC right now
Turn the key on and it dropped to 12.95, cranked and cranked with no start. Fuel pump is priming just fine. Voltage during cranking is between 11-11.5
Applied the booster at 40 amps, bike started immediately. Stator puts out 13.75 VDC at idle. Removed the booster, shut off the bike at kill switch leaving the key on. Battery is holding at 12.9 VDC. Starts immediately off the booster. Several times.
Shut off the bike at kill switch, left the key on, all lights on for five minutes. Battery is at 12.5 VDC. Started immediately.
While running, I removed the ground and the bike died. Reinstalled ground. Bike didn't start.
I don't believe it's a bad battery. Check this out.....if I turn on the key, then turn on the booster the bike will not start. If I turn the booster on first, then turn the key on, starts right up.
2006 Nomad 1600 - project
2013 Yamaha Super Tenere
2008 Husqvarna TE450
1970 Honda Trail 90