Hello thank you for reading this any advice us greatly appreciated. I have a 1992 Lexus Sc300. it has a radio up front and an external amplifier in the trunk. i am trying to put in A56815 toyota radio. i have already made an adapter harness from the oe lexus radio plug to the new toyota plug. the radio i chose has an internal amp. sound quality is not a huge concern. i bypassed the factory amp in the trunk using a custom harness i made(one end of the harness plugs into the wires coming from the radio the other end of the patch harness plugs into the plug that goes to the speakers. the purpose of this is too not have to run new wires. the radio comes on and works but only for a bit then shuts off. the back of the radio is hot enough to burn you. the oe radio send one ground to the bypassed amp in the trunk. i then split that signal ground into 4 grounds 1 going to each speaker. the factory speakers are 4 ohm. does anyone know whats going on or have any ideas on what i can try to get the radio to continue working. thank you so much
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