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PR18N-40B - Amp Meter 0-40A w/Boost Snap-In w/Inductive Pick-Up for Associated/Schumacher Battery Chargers


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Snap-in amp meter. 0-40 amp scale. Snap-in mount to charger panel. Inductive pickup, no meter connections required. Original replacement for various 25-40 amp chargers from Schauer, Schumacher, etc. 
Direct replacement for Schumacher meter 5399-100-141.

Also replaces:
• Schumacher meter 5399-100-097
• Associated meter 610695
Used in various other 20-40 Amp Chargers with Boost.
This meter may be fitted in any battery charger with a 1.3"H x 2.15"W mounting hole in the panel. Snap-in mount to charger panel.


• Bottom Movement - Needle pivots from bottom
• Inductive Pick-up - Current detected from charging circuit wire routed through inductive pick-up tube, no meter connections required
• Accuracy: 5% of Full Scale
• Made in U.S.A.


• 1.4"H x 2.3"W Bezel Frame Outer Dimensions
• 1.3"H x 2.15"W Panel Mount Hole

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Customer Reviews

Based on 7 reviews
Thomas Rice
Snap in ammeter

Great support. Phoned in with a question and got my answer quickly. Meter went in easily. Thanks Scott

gary lagnese

fantastic service. Great over the phone help.

Joe Daniel
Did not work

Would not read current. Clip was flimsy and losses but held on.

Hi Joe,

I'm sorry to hear that you were disappointed with the ammeter that you recently purchased from us. I am a bit curious about the specifics of your complaint. Various charger manufacturers have installed this same meter in about a zillion chargers over the past few decades, and we've not had any issues that I can remember.

We would like to fix this for you by offering a couple of options:

1. If you think it's just a bad meter, and would like a replacement, please contact us and we'll send you a new PR18N-40B.

2. If you would prefer a non-inductive meter, please take a look at the PR18H-70B. It's scaled to a slightly higher amperage, but would work in your charger and it mounts in the same hole size. The big difference is that it's not inductive. If you're comfortable with making the necessary wiring modifications (adding ring terminals to the DC lead wires for connection to the meter), we will send you a PR18H-70B at no charge.

Here's a link to the PR18H-70B on

I hope we hear from you soon. Please reply to:

You can also call us at 618-687-3344.

Best regards,

Rick P
PLP Battery Supply

Gary Galindo
easy to install works great

All working perfect,
Easy to install and worked as it should.

Connally Edwin
Snap-in Amp Meter

Thanks , Sorry I thought that I had already left feedback ... Worked fine , easy to install , Hope to see you again ...