Alternator and voltage regulator question

That is very possible. I haven't gotten a chance to check everything out yet. I think it's something of what your talking about. At operating temp at idle it's right at or under 15 on my gauge. When I drive it, it will be fine for a bit and then get erattic . It seems to jump up when you get on it, but not all the time. Think it's a hot side connection or grounding issue?? I'm going to start checking everything and I'll post what I find... As far as the car,, battery is in the trunk, alternator is on the driver side, full msd ignition, and bulkhead is modified, also ammeter is bypassed. Any opinion or help is great.
Thanks