Welcome to iRV2.
Can't say I've ever heard of a Sun Clipper, so I have to ask questions .
What class of motor home is this , and can you tell me what engine or chassis it's built on ?
I am assuming that your talking about the dash voltage gauge.
Have you tested alt output to the battery with another volt meter?
No sense chasing down a voltage regulator if this is only a gauge problem.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.