I just swapped a F20B in my accord from a F23A4 ULev with the F20B ECU and everything starts up and runs but I am getting a 12.5 drain on the battery when the ignition is not on.

i went through all of the fuses under the hood and on both sides of the dash and i still have have a 12.5 volt draw.... any help on possible relays bad? I unhooked the ecu, starter, and alternator and i still have a 12.5 draw...so i unhooked the power wire to the under hood fuse box and the draw went away so thats why im thinking its a relay stuck on... fuel pump still turns on when i turn the key to the on position. Any help is greatly appriciated!!!

 

Anyone?

 

I'm not sure what a 12.5 volt draw means.

If you go to youtube and search for "parasitic drain auto" you'll get some howto's on how to test for a parasitic drain if that's what you have.

 

I have already tested all the fuses....

 

Did you test the relays tho? Test the relays and replace any bad ones. If no bad relays, then replace the under-hood fuse/relay box.

 

i did pull a couple relays from under the steering wheel to see if that would take the draw away but i didnt have any effect.... does anyone know where and how many relay i have to check?

 

it means when i disconnect the neg terminal and put the tester on the neg terminal and the neg cable im getting a -12.6 on the reader

 

Check all the relays in the under-hood box first.

 

yeah that was my first check

 

Now I'm thinking the under-hood box itself has an open.

 

yeah cause when i would take the power wire off the under hood fuse box it the drain would go away... what would you suggest my next move would be?

 

so we went through and continued unplugging plugs connected from the harness to the the motor and nothing changed last night..... the only rewiring that i can think of that we did for the swap was to change the plug for the dizzy from 4-8 prong and we had to switch the prong on the ecu plug so that we could get the fuel pump to work with the f20b ecu after trying to start it with f23 ecu.... I dont know if it could be the main relay?! im running out of options to check..... i have done numerous google searches and forum searches and it seems like there isnt anyone that has had this problem but i still believe someone has ran into this before! (possibly on an H22 swap??) please if anyone has any suggestions let me know!!!! thanks in adance!