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Author Topic: Bachmann N scale GP7  (Read 1184 times)

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mrp

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Bachmann N scale GP7
« on: November 23, 2020, 02:32:33 PM »
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The decoder appears to be on the fritz in this engine. It run for a few minutes; then gives up.
Wait an hour or so and repeat.
Has anyone replaced the Bachmann decoder with something else?
Everything is easily accessible inside, but not much vertical clearance.

Michael Pennie
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Kentuckian

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Re: Bachmann N scale GP7
« Reply #1 on: November 23, 2020, 04:38:42 PM »
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I don’t have this particular engine but I have some other Bachmann diesels and I have installed Zimo 600 series decoders in them. They are switchers, so I don’t have to worry about trying to MU them with other units. I think they even have smaller decoders now.

I have since decided to use the ESU brand exclusively and have drank their kool-aid. I believe either brand makes something that would fit.
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Steveruger45

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Re: Bachmann N scale GP7
« Reply #2 on: November 23, 2020, 08:59:46 PM »
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The older lokpilot micro direct might be a good choice.  It has leds already installed but you would have to hard wire it for the motor and rail/frame pickup (4 wires) and be sure nothing touches The frame that shouldn’t and shorts out
http://www.esu.eu/en/products/lokpilot/lokpilot-micro-direct/
« Last Edit: November 23, 2020, 09:01:31 PM by Steveruger45 »
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Steve

mrp

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Re: Bachmann N scale GP7
« Reply #3 on: November 24, 2020, 07:47:31 AM »
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It looks like the lok pilot footprint will work, so will give it a try.
Thanks for the help

Michael Pennie
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EL3632

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Re: Bachmann N scale GP7
« Reply #4 on: November 25, 2020, 06:52:00 PM »
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Had that happen with two of mine. I mothballed them after the decoders quit, haven't replaced the decoders yet. I am curious as to what your results are.
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mrp

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Re: Bachmann N scale GP7
« Reply #5 on: December 01, 2020, 06:16:33 PM »
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I wouldn’t have thought to use a plug g & play decoder as a wired decoder, but that is what I ended up doing.

I had a NCE N12A0 on hand, and it fit the Bachmann plastic mounting brackets just fine
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Solder the motor leads to the decoder pads that normally connect to the motor tabs.

For track power, I drilled & tapped the frame for a couple of #90 screws; then just run wire to the pads that would normally connect to the frame.

Having the onboard LED’s makes this whole thing fairly easy.

The NCE equipped engine runs a bit faster than my other GP7 with the original Bachmann decoder. I ended up using the NCE 3 point speed table to get a good match (used the Digitrax CV table for a mainline engine).

Thanks for the ideas on this.

Michael Pennie
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