[Diesel Krazy]

I checked things out tonight. I took the regulator and the starter generator off. I took both of them apart and looked at everything and all looked good. The voltage regulator looked like new inside but the outside looks like it's been sitting outside since 1962. It said Delco Remy on the regulator, is that original? I assume the starter generator is not original because it has black original paint. All the connections looked good and I metered all wireing to be sure the wires are good. I put everything back together and started it up and it is charging but not at idol. If I run full throttle it will gradually creep up to 13+ volts, at idol or just above it doesn't seem to charge. About half throttle and above is when it starts going up. Is this normal or is the starter generator weak and in need of a rebuild? I am charging the battery tonight to make sure it's 100% fully charged and I will retest again tomorrow using the posted tests.