Question for Pro-Logix Charger Owners

[SubLGT]

Does your Pro-Logix charger make a lot of relay clicking noises at the tail end of charging, just as the charger transitions from absorption phase to "completion" phase? (This transition is visible as a quick drop in displayed voltage from around 14.6V to around 13.7V).

In my new PL2310 charger the relay off/on clicks are very short, and repeat every 2-3 seconds, and can go on for several minutes. I checked the AC input current to the charger with a clamp meter, and the current oscillates in sync with the relay clicks. In 5 years of use with my old PL2320 charger I never heard repetitive relay clicking.

Clore Automotive tech support tells me (via email) the relay is "turning the power on and off" as part of the battery recondition mode. But according to the owner's manual, recondition mode is engaged if necessary at the very beginning of charging, and therefore I should be hearing multiple relay clicks at the beginning of charging, but I do not. I hear the multiple relay clicks at the end of charging.

 

[Leo99]

I rarely use my Clore PL2320 but tried it last week and it's throwing error code and not working. I bought a Noco Genius. My PL2320 never worked right.

 

[BHopkins]

My Pro-Logix PL2510 is over 10 years old, and I have never heard any relay clicking in it. Admittedly, I've only been in the garage when it transitions from charging to maintenance a few times. But as old as mine is, perhaps it has different technology inside.

 

[Wheel366]

I hear my CTEK 7002 click once in a while. Even sometimes when it is already green for fully charged.

 

[JHZR2]

I have an older pro-logix. It does click a relay when you enable charge. I suspect it disconnects at end of charge, that’s reasonable, multiple clicks seem odd…

 

[paulswagelock]

Mine clicks multiple times during a charge sequence. Has always done that. Not in rapid succession though.

 

[anthonym6]

Just got one (PL2310) and it does the same thing at the end of the cycle too. It does seem odd to me too, but maybe it's normal.

 

[SubLGT]

.....Clore Automotive tech support tells me (via email) the relay is "turning the power on and off" as part of the battery recondition mode......

I don't believe what tech support says about battery recondition mode. In my 5 year old PL2320 charger (which died 3 months ago) battery recondition mode engaged at the very beginning of charging (as do the recondition modes in my CTEK and Optimate chargers), with a very rapid ramp up to around 15.7V and a constant current around 4A. There were no multiple relay clicks, and no "turning the power on and off".

The Pro-Logix owner's manual clearly states that the recondition mode begins before the standard charging cycles begin, and not at the end of charging as tech support implies.

The PL2310 I have now is an exchange for the one I returned to Amazon 2 weeks ago because it had the weird relay clicking, and also had the weird behavior of briefly running the cooling fan for 2 seconds immediately after the cold charger is connected to AC power.

 

[JHZR2]

The PL2310 I have now is an exchange for the one I returned to Amazon 2 weeks ago because it had the weird relay clicking, and also had the weird behavior of briefly running the cooling fan for 2 seconds immediately after the cold charger is connected to AC power.

My very old one did that in 17F weather the other day. It’s smart to check the fan before putting high current through it.

 

[SubLGT]

My very old one did that in 17F weather the other day. It’s smart to check the fan before putting high current through it.

My 5 year old PL2320 never ran the fan immediately after connecting to AC power.
My 1st PL2310 ran the fan immediately after connecting to AC power.
My 2nd PL2310 never ran the fan immediately after connecting to AC power.

Running the fan at startup seems to be an inconsistent "feature".

 

[JHZR2]

My 5 year old PL2320 never ran the fan immediately after connecting to AC power.
My 1st PL2310 ran the fan immediately after connecting to AC power.
My 2nd PL2310 never ran the fan immediately after connecting to AC power.

Running the fan at startup seems to be an inconsistent "feature".

Possibly. But not sure it matters. Seems a best practice.

 

[anthonym6]

My 5 year old PL2320 never ran the fan immediately after connecting to AC power.
My 1st PL2310 ran the fan immediately after connecting to AC power.
My 2nd PL2310 never ran the fan immediately after connecting to AC power.

Running the fan at startup seems to be an inconsistent "feature".

Clicking relay on the 2nd one? I feel like I may need to do an exchange. Doesn't seem normal to me, but I don't have any other ones to compare.

 

[SubLGT]

Clicking relay on the 2nd one? I feel like I may need to do an exchange. Doesn't seem normal to me, but I don't have any other ones to compare.

Both samples of PL2310 (one I received in Dec 2025, the other I received Feb 2026) have a relay clicking excessively near the end of charging.

 

[SubLGT]

Made a few measurements today, on the PL2310, after it was 98% done with charging, and still connected to the battery. The charger was displaying 13.2V and the relay was clicking every 2 seconds. DC current to the battery read "zero" on my Fluke clamp meter, and the DC voltage was pretty stable, but did do a 0.07V spike in synch with the clicking noise. On the AC input current (measured with the Fluke and a 10X AC line splitter) I saw an oscillation between 0.05A and 0.25A. After 18 minutes of hearing the relay click every 2 seconds, I disconnected the charger from AC power.

 

[anthonym6]

Sent an email to them....

Just purchased a PL2310, and when I connect it to a battery at 95-100% the relay clicks on/off every few seconds. Is this normal operation?

Their reply - Yes, that is normal. You are hearing the relay turning on and off the power as needed.

I replied to them with a video and asked to confirm as it seems excessive. No reply at this time.

 

[SubLGT]

I can't think of any good reason to cycle the AC power to a charger every 2-3 seconds at the end of charging, when the charger is in float phase. If this is a feature, it should be mentioned in the user's manual, but it is not.
I am returning my sample to Amazon tomorrow. I have totally lost confidence in Pro-Logix chargers and their tech support staff.

 

[anthonym6]

I can't think of any good reason to cycle the AC power to a charger every 2-3 seconds at the end of charging, when the charger is in float phase. If this is a feature, it should be mentioned in the user's manual, but it is not.
I am returning my sample to Amazon tomorrow. I have totally lost confidence in Pro-Logix chargers and their tech support staff.

Agreed, and I am also returning mine.

 

[SubLGT]

........I replied to them with a video and asked to confirm as it seems excessive. No reply at this time.

Did they ever respond to your video?

 

[anthonym6]

No they did not. Returned it to Amazon earlier this week.

 

[SubLGT]

Before I tossed my deceased 5 year old Pro-Logix PL2320 into the trash can, I opened it up for a look. The black box at top-center is a Sanyou 16A relay. I don't see any leaking capacitors.