Re: (ET) Card 4 status, might work, hm.

[Tim Humphrey <hump evgrin com>]

About 3 years ago, I ripped out the card 4 and the broken edge
connector from my I-5 and replaced them with just 4, 15 cent diodes
spliced directly into the wires. I don't have cruise nor the three
field weakening speeds. I don't care; it just plain works.

On Sun, Sep 12, 2010 at 12:58 AM, David Roden <etpost drmm net> wrote:
> On 11 Sep 2010 at 22:55, Chris Zach wrote:
>
>> ... blown resistor ... 10 gauge crimps ... melted ... bolts ...
>> overheated ... sense wires ... covered with carbon ... speeds 6,7,8
>> are still out ... strip of metal gets hot .... card 4 ... amplifier
>> transistor is shot ... MOV was once again blown to bits ... caught fire
>> ...
>
> Yikes.
>
> About 5 years ago, I ripped out all that Apollo-era hardware and put in a
> modern PWM controller instead.  That took me from having to tinker with a
> card, reverse relay, or what have you about every third time I used the
> tractor ... to just USING it.
>
> Since then the only problem I've had has been a flaky reverse switch - 
> and
> that's my own fault for installing a cheap made-in-Taiwan Radio Shack 
> toggle
> switch for reverse.
>
> I sympathize with the notion that you can troubleshoot the GE controller
> with an ohmmeter.  However, I don't want to be troubleshooting it all the
> time!  A tool that you have to regularly use other tools on isn't my 
> idea of
> a truly useful tool.  ;-)
>
>
> David Roden - Akron, Ohio, USA
>
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