Ddx6906 deck problem

[Gksportster]

Hello I have a 38 Oldsmobile business coupe.
what my problem is everything is fine
When I use anything that I put a relay on like headlights and cruise control. When i set my cruise it activates the relay the deck will stop playing music tell I shut it off and restart the deck.
is their a resistor or dioad I can use on the main power to keep the spikes?
I ran a new power wire from battery to deck and it still did the same thing

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