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high swr when amp on. flat swr when amp off

I have a galaxy 959 going to a k40 magnamount on an 05 Titan. no probs, sounds good SWR 1.1:1. When I put my little Texas Star Mod V 100 watter, swr's shoot up to 2.5. Patch cord is good.

Galaxy 959 --> T.S. 100 w. --> k40 swr's are perfect even with the amp inline just as long as it's off. the second I flip the switch swr's bug out. amp is run directly to both battery terminals. was told i should ground the radio & amp together and also ground the amp to the vehicle. would hate to ruin the radio or amp so any help would be appreciated!

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getting this reading from swr meter in radio. meter is accurate because i checked the reading (before amp was installed) against paradynamics meter and reading was the same. also something interesting--when i check the swr using radio meter, i dead key and get swr of 2.5 but when i whistle, it swings down to an acceptable swr. this is puzzling : (
I connected a 100 watt tuner from radio to 300 and it took SWR way down for radio
 
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