98 neon H/U install head scratcher help!!!!

[tdawg30 10+ year member]

Ok so ive installed a number of headunits in my time in car audio. I know im not perfect and with that being said, here's my dilemma.

I installed a pioneer deh-p790bt for my friend about a month ago. it plays fine, with the exception of it draining the batt. Now I know all about the power wires(red is acc) and (yellow is constant) and ive got those matched up just fine, but apparently it still is draining power and I just moved out to Cali from Ohio which is where the car and radio are so I cant really troubleshoot any further than I did before I left. so any ideas would be great for him to try, im just lost. thanks

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[pentavolvo 10+ year member]

put an ammeter in there and pull fuses and see if it really is the radio

 

[loopkiller 10+ year member]

Does the HU stay on when the key is off? If so, no need to check fuses. If it does turn off with key off, then it is likely a small short somewhere. Chances are the HU stays on all the time and that would be due to mixed up constant and acc power wires. I know you said you had them correct, but the wiring kit may have been wrong.

 

[tdawg30 10+ year member]

I was thinkin the wiring kit may be wrong as well, but everything turns on when the key is in acc and turns off when its supposed to. he tried switching the red and yellow with each other and that didnt work, so its prolly a short, but the question then is where, and how far up in the dash is it or where in the engine bay is it? also we pulled every fuse in the car and checked for shorts and we didnt locate a short from that method, idk im at a loss and hes prolly gonna have to take it in to a shop. augh thanks guys