Getting a loud feedback sound when load on amp

[Varinabassing 10+ year member]

Ok so I have a issue. If I on have one 3 way xover hooked up it plays fine but if hook up both circuits I get a horrible feedback sound. Put a dmm on each xover and getting 4.5 ohms. Amp is grounded at battery along with the head unit. It's a corvette and I couldn't find a decent ground so ran them to the battery. If I cut the gain down it will be fine but as soon as gain is increased it goes nuts. Also if I keep gain down but cut the radio up I get he same noise. Can't seem to wrap my head around this one any ideas ? Thanks

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