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Tractor Talk Discussion Forum

Re: trailer brake magnet amp draw

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Author  [Modern View]

07-02-2013 09:12:15

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"BRAKES - How do I measure brake current or amperage?"

"Dexter 7" brakes draw about 2.5 amps per brake and {{{{{{all other brake magnets draw about 3 amps per brake}}}}}}. The total system amperage is calculated by multiplying this number by the number of brakes/magnets connected to the brake system. To measure the brake current, the engine of the towing vehicle should be running. Disconnect the wire at the point that you wish to measure the current draw and put the ammeter in series with this line. Make sure your ammeter has sufficient capacity and note polarity to prevent damaging your ammeter. NOTE: If a resistor is used in the brake system, it must be set to zero or bypassed completely to obtain the maximum amperage reading. The amount of current draw will depend on what point you are measuring. If the ammeter is at the plug, you will get the total current draw from all magnets. If the ammeter is connected at one of the magnets, you will measure the current draw through that magnet only."

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John T

07-02-2013 11:41:52

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 Re: trailer brake magnet amp draw in reply to Bob, 07-02-2013 09:12:15  
You're kinda handy to have around when it comes to sparky chat Bob

John T

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07-02-2013 09:43:50

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 Re: trailer brake magnet amp draw in reply to Bob, 07-02-2013 09:12:15  
Many thanks, bob--exactly the info I needed--

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