94 allegro house batteries not charging

[chads242]

Hi everyone . I am having a problem charging my house batteries. The charger is working it is putting out13.8 volts and as I flow the power when it gets to the remote battery disconnect relay the power isn't going through it. I check the switch and it seems to be working but why will the charging power go thought it. Any help would be great. Thanks. And by the way when I run a jumper wire from lug to lug on the relay it will charge then

[450Donn]

Bad switch.
How did you check the switch? If you have 12VDC on one side and not the other side, it is either switched off or defective. It is pretty simple. The contacts on the switch are probably burned or broken. Either bypass the switch and connect the two leads together and wrap them with tape or replace the switch.

[chads242]

Well that's just it the switch has voltage on both sides and when switched to disconnect it works . There is no power on the one side. Why does the charge not go through the relay. Could it be wired backwards? Or is there a way to test it? If it works to disconnect is it good?

[hometool]

it seams to me your disconect relay is not closing could be bad relay or a wiring isue when you see power on both sides it,s because you have the batterys on one side and output from charger on the outher lee

[chads242]

Correct but with the charger not on it still has power on both sides in the off position and on the on position battery side is hot and to coach is zero voltage. The relay was wired backwards so I just took care of that and still when the charger is on I get13.7 from coach charging unit to coach side of relay and 12.4 volts on the battery side the relay is not letting the charge through to the battery. Why?

[hometool]

in your 1st post you said if you jump the relay it will charge the battery that relay has to be open when it should be closed lee

[chads242]

Yes if I jump the post it does charge . So just because it seems to work it still is not working correct

[Dave78Chief]

The only way what you describe could happen is if the relay was being switched back to the "disconnect" position when the converter is turned on. With the converter OFF, place the relay in the "connect" position (Battery B+ on each side of relay) then remove the 2 control wires to the relay so you know it cannot receive a disconnect command. Turn on the converter and you should now see the 13.8VDC converter on each side of the relay. If not, then something is wrong with the relay such that when charging voltage is applied to the coach side of the relay it is switching back to the "disconnect" position. One final check is to verify this by turning the converter OFF and now confirming battery voltage is removed. The only thing that could confuse this is if the chassis/coach battery isoaltion relay (i.e. AUX START) was energizing such that the voltage you think is B+ on each side of the relay is actually the chassis battery voltage.

Dave

[chads242]

Thanks everybody I will check out what Dave said I think it is finally sinking in . Will let u know tomorrow.

[chads242]

Good news. I took the relay out and tested it only worked sometimes and sometimes had continuity threw it. I took it apart and the washer inside was black and was stuck I cleans it up and I think problem solved. I now seam to be charging 13.4 volts at house batteries . That seem a little low but the battery bank is at full charge so I take it is more tending the batteries than charging. So thank u to everyone
Chad

[JohnRR]

Thank you for the update, they are important.