Where to get a system rewired

[P4dstar]

Evening chaps. As some of you know I’ve had a battery warning on my Grippa hot water system since it was installed. I’ve changed the batteries several times. Most recently last week two new ER500’s were put on. Given a good charge and have been plugged in on charge every night. I’ve connected by Bluetooth and checked the charger is working. The bat symbol popped up again this afternoon. We had two men on the van for the first time since the batteries were replaced.

Secondary issue has popped up, there is a random number flashing on the controller. Yesterday it was 5, today that became 4. It flashes every few seconds regardless if the system is on or off. I’ve spoken to Ian from Spring and ran through several different things. I think we have a faulty temp probe and the number thing might be linked.

So that’s where I’m at with it. At this point I have to assume there is a wiring fault. 4 sets of batteries can’t be faulty! Can anyone suggest someone who might be able to change the entire wiring system? I’m not going to expect someone to find the fault per se, I imagine they would just be happier replacing the whole lot. I wonder if the length of wires used or some dodgy connections along the way are to blame.

 

[ched999uk]

It will probably be a poor connection. You might struggle to find someone who has done this work before but it's fairly basic stuff I would guess most auto electricians could sort it.
What you could do is start at the battery end and follow the wires to the hot water system, check each connection as you get to it. Ideally use a multimeter and check the voltage drop at each connection, that should help you find the voltage drop issue. Ideally test when it's running as the more current it's pulling the easier it will be to spot a voltage drop at a connection point.

 

[Pjj]

You need a good marine or auto electrician who knows what he’s doing it would be a simple job for them

 

[P4dstar]

Thanks chaps. I have previously contacted a number of auto electricians, most just give it a wide berth. It seems they all want to install stereos and run diagnostics. I contacted van conversion places and they just turned us down. There was one willing to have a look but they’ve done some work before (fitting reversing sensors) and left quite a bit of poor workmanship. I might give Cheds idea a go and trace back the connections. One of my big points was the battery connection itself, I’m confident they’re secure and I’ve used copper grease on the terminals to. Not sure what else can be done there.

 

[ched999uk]

I'm guessing that for most auto electricians a diesel heater is well out of their comfort zone. I wonder if a truck service centre might be better or a canal boat service place as both have similar heaters.
If you go for tracing connections, use a multimeter and test +ve voltage at every joint or connection, you also need to test all -ve connections. It sounds like a hight resistance connection is causing a voltage drop at the heater. Maybe a corroded earth, or iffy fuse connection.

 

[spruce]

I'm guessing that for most auto electricians a diesel heater is well out of their comfort zone. I wonder if a truck service centre might be better or a canal boat service place as both have similar heaters.
If you go for tracing connections, use a multimeter and test +ve voltage at every joint or connection, you also need to test all -ve connections. It sounds like a hight resistance connection is causing a voltage drop at the heater. Maybe a corroded earth, or iffy fuse connection.

The fuse holders are a good start.

 

[spruce]

You need a good marine or auto electrician who knows what he’s doing it would be a simple job for them

I'm afraid finding a good auto electrician is getting harder and harder these days. You have a good marine electrician, but I'm not sure how many of them are left now. It's the old guys who were taught properly, completed exams and have a wealth of experience behind them, are all getting/got to retirement age. The youngsters replacing them are, in my experience, with a few exceptions, a total waste of time.

 

[clearview]

My first check would be to make sure it’s got a good clean earth as I had issues with mine saying voltage was low on the v16 controller but when measured at the battery was 13 odd volts so put a second earth on the tank/frame and was spot on.