The factory stock JBL 3145 crossover network L-pad color coded wiring goes a follows:

The L-pad that is on top has a green wire, a black wire & a an orange wire. This goes to the "Ultra High Frequency Level" (JBL 2405 Tweeter.)

The L-pad that is in the middle has a brown wire, a red/white stripe wire, & a white/black stripe wire. This goes to the "High Frequency Level" ( JBL 2425 compression driver / horn)

The L-pad that is on the bottom has a red wire, a yellow wire, & a blue wire. ( JBL 2122h Mid-woofer)