Help! Parallax 7300 blowing 1 30a fuse & not charging batt
So I have a 2009 Winnebago access 31c just bought it from original owner. I went down to replace the bulbs with LEDs and found them dim so I check the status meter and batteries were dead I thought this was weird because it's plugged in. So I checked the fuses on the box see pic of similar below. ( I didn't take a picture of my actual unit) it's blowing the top right 30 amp fuse only, not the left one.
So I replaced it and it pops instantly, so I unplugged battery positive cable put fuse in and all good had wife put cable back on and poof. I understand these are for reverse polarity protection but from what I understand it would blow both if batteries were in wrong.
Random info
1. Plugged into shore power microwave powers on
2. Engine running 13.8 volts on battery under hood 7.8 volts on house batteries
3. Batteries are both brand new
4. When I put batteries on trickle charger the lights go real bright. ( I have the rv plugged into shore power and trickle charger plugged into 110 outlet in the rv charging the batteries)
5. Previous owner replaced batteries because the guy told him they were bad and that's why lights were dim
a. I understand new batteries would make lights brighter and that's what happened after replacing them but I believe this to be an early sign of the real problem, of the converter blowing the fuse and batteries not recharging and lights now being dim again.
6 I don't believe the batteries to be wired incorrectly they are in parallel
7. Checked breakers In a compartment and none were tripped ( not the ones to left of fuses in pic below but a diff one they are like pop out breakers (round buttons)
8. when I checked voltage at blown fuse leads I got same voltage as batteries on it
9. Fridge works - furnace works
I will try to take pics and better explain what I find with volt meter at various points.
I have tried to find wiring diagrams or ts document but they all seem to have been removed from parallax website. I'm leaning towards this unit being bad although I can't rule out a short just yet either.
Any help is appreciated, if I need to test something different or provide more info just let me know what.
So I replaced it and it pops instantly, so I unplugged battery positive cable put fuse in and all good had wife put cable back on and poof. I understand these are for reverse polarity protection but from what I understand it would blow both if batteries were in wrong.
Random info
1. Plugged into shore power microwave powers on
2. Engine running 13.8 volts on battery under hood 7.8 volts on house batteries
3. Batteries are both brand new
4. When I put batteries on trickle charger the lights go real bright. ( I have the rv plugged into shore power and trickle charger plugged into 110 outlet in the rv charging the batteries)
5. Previous owner replaced batteries because the guy told him they were bad and that's why lights were dim
a. I understand new batteries would make lights brighter and that's what happened after replacing them but I believe this to be an early sign of the real problem, of the converter blowing the fuse and batteries not recharging and lights now being dim again.
6 I don't believe the batteries to be wired incorrectly they are in parallel
7. Checked breakers In a compartment and none were tripped ( not the ones to left of fuses in pic below but a diff one they are like pop out breakers (round buttons)
8. when I checked voltage at blown fuse leads I got same voltage as batteries on it
9. Fridge works - furnace works
I will try to take pics and better explain what I find with volt meter at various points.
I have tried to find wiring diagrams or ts document but they all seem to have been removed from parallax website. I'm leaning towards this unit being bad although I can't rule out a short just yet either.
Any help is appreciated, if I need to test something different or provide more info just let me know what.
