I have a three stage charging regulator, a Heart XAR-12. Lately, the "ACCEPT" LED never comes on, although it appears to be in accept mode, since it holds 14.2 V. Also, it doesn't seem to regualte the alternator for maximum current in bulk mode, only about 50 Amps, when it used to be almost 100 Amps. Anyone have experience with this particular regulator?Thanks,jv