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Re: [Shop-talk] Which diodes for a battery charger?

To: Karl Vacek <> s=q20121106; t=1361942059; bh=kAxaWitRvmERPwDd04D/KRq+9OCFm3iP/c9frJIwc/U=; h=Received:Received:Date:From:To:Message-ID:Subject:MIME-Version: Content-Type; b=eIFZ+b0P1TVYNlzxKa0FCPVk2qfpt2AXxVP5rcNvxMT8wam0Uqk3i4xU6k5SqXHem 3fG/ZrG7ZE5avDFtW3gu8iwFyBLoirhvkSN3QrV/pz8Ex3sIqFAylvTFFqDvcWR9kS 0GRNZHBa+ISfKKbGMuosKcMqonykMk6U1GsX4RxNyMdlI4ulu/xib9xX7Qc4UBCAcV jYvercqFmJ65kQw8QPlo4W9V1sURkcY8TlKxaGuHNdoVciFmzY7XnNrlTiwkm1mahr Z3IkP0ahsPZXw9CjEKX1iMT3FrSJbKVZWqzJ0XeO4v70T66x5wNaIudTCE49gLQqrQ ywNtZf/JQ4Vcw==
Subject: Re: [Shop-talk] Which diodes for a battery charger?
Date: Wed, 27 Feb 2013 05:14:18 +0000 (UTC)
Any diode tough enough to be used in a battery charger will not be damaged by 
an ohm-meter, so you can figure out the polarity that way.

Phil Ethier West Side Saint Paul Minnesota USA
1973 Triumph Stag LE22439UBW "uncle jack", Sapphire Blue
2004 Suburban 8.1, Sport Red, the only automatic of the bunch
2005 Lotus Elise, Bordeaux Red Pearl
2007 Saturn Ion 3 2.4, Berry Red

----- Original Message -----
> From: "Karl Vacek" <>
> To:
> Sent: Tuesday, February 26, 2013 9:39:50 PM
> Subject: [Shop-talk] Which diodes for a battery charger?
> My old Schumacher battery charger has been dead for years. Used to be
> able
> to go to the factory for new diodes, fixed inexpensively while I
> waited, but
> they moved away. I'd like to repair it with better diodes this time.
> I'll
> also put a muffin fan into the case to help cool the diodes and the
> huge
> transformer.
> The present diodes are little buttons that appear to just be clamped
> between
> a brass contact plate and an indentation in the aluminum flat plate
> heat
> sink. They're Motorola diodes, MR2502 on one transformer lead (a pair)
> and
> W9312 on the other transformer lead. The charger is 10 amps
> continuous, 30
> amps fast boost (duty cycle 10 minutes on, 12 minutes off), and 50
> amps
> motor starting (duty cycle 2 minutes on, 5 minutes off)
> I look at diodes and see all sorts of ratings, and don't know what's
> better
> and what's overkill. May I please have a recommendation as to what
> rating,
> etc.? A part number to order from XXX company would be even better.
> Also - are there positive and negative orientations to the diodes in
> there
> bow? They're not marked, and if their polarity is related to label
> orientation, then one pair is mounted with both oriented the same
> direction,
> while the pair on the other lead are oriented opposite each other.
> Thanks!
> Karl
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