slovcan Posted December 13, 2015 Share Posted December 13, 2015 Hi folks, Can I get someone to check the running voltage at the battery of their 3rd gen with the mosfet R/R - idle up to 3000 or 4000 RPM, please? I just put my replacement mosfet R/R in and am getting 13.80-13.85 volts at any and all RPM's. On the face of it that should be fine as the normal voltage of the AGM battery is 12.8 anyway. However, if I were to put in a LiFePo4 battery that won't be enough. They require 14.2 charging voltage. I do get that and a bit more with the original R/R. I keep asking myself why I changed it to get less output. Mind you, it is exceptionally stable voltage at all RPM's where the original R/R allows more variance depending on revs. Thanks, Glenn Link to comment Share on other sites More sharing options...
Member Contributer JZH Posted December 13, 2015 Member Contributer Share Posted December 13, 2015 I don't have a MOSFET reg/rec on my FP, but the spec is 13.5v - 16v @ 5,000 rpm, so your reg/rec seems like its working. Ciao, Link to comment Share on other sites More sharing options...
slovcan Posted December 13, 2015 Author Share Posted December 13, 2015 Thanks JZH. I think it will be OK, then. Hopefully others can jump in with their numbers for real peace of mind. Cheers, Glenn Link to comment Share on other sites More sharing options...
vfracer750 Posted December 17, 2015 Share Posted December 17, 2015 My RR voltage is anywhere from 13.5-13.8 on my 92 VFR. A little on the low side. I have an OEM RR with heavier gauge stator wiring and a ground directly to the battery. Was thinking about upgrading to a Mosfet RR. Roger Link to comment Share on other sites More sharing options...
slovcan Posted December 17, 2015 Author Share Posted December 17, 2015 Thanks vfracer750. Yeah, same as mine is now with the mosfet R/R, but mine is oddly 14.4 with the original R/R. Still, I think it will be perfectly fine (yours, too) since it is still a full volt above the resting voltage of a good AGM battery. I just don't think it is enough for the LiFePo4 batteries if I chose to go with one of those next time. They need 14.2 volts. Cheers, Glenn Link to comment Share on other sites More sharing options...
squirrelman Posted December 17, 2015 Share Posted December 17, 2015 I don't have a MOSFET reg/rec on my FP, but the spec is 13.5v - 16v @ 5,000 rpm, so your reg/rec seems like its working. Ciao, 16 volts might be TOO MUCH. Link to comment Share on other sites More sharing options...
Member Contributer JZH Posted December 18, 2015 Member Contributer Share Posted December 18, 2015 I don't have a MOSFET reg/rec on my FP, but the spec is 13.5v - 16v @ 5,000 rpm, so your reg/rec seems like its working. Ciao, 16 volts might be TOO MUCH. It might be, but it is the Honda spec... Ciao, Link to comment Share on other sites More sharing options...
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