Hi John, I have a question for you concerning the echo charger, How do you know that it needs to be replaced? Often times the 2 inline fuses are overlooked. The fuse holders are yellow and can be traced by following the wires from the echo charger, The red wire with the yellow stripe is the charge line for the chassis battery and the solid red wire is for the house batteries. The fuses are 15amp agc (old glass style). It is not uncommon for these to "blow"if batteries are low or reaching the end of there life cycle. Just tryin to help.... Fred