Have an orange box sitting around but it has only four pins, all the other ecu's i have are five pin. The missing pin wire runs to the top right of the ballast resistor. Can it work or should i leave it sitting for a time i might have a car it can work on?

TF

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Even in moderation i am excessive!

The 4-pin ECUs replaced the 5-pin items in production around 1978 or so. The 5-pin modules use a dual ballast resistor with 4 terminals, while the 4-pin unit uses a single ballast resistor (2 terminals). Both 4- and 5-pin ECUs can be had from reputable makers like Standard-Bluestreak and Echlin. Careful, the Mopar boxes (black, orange, chrome, gold...) have been of inconsistent and poor quality the last six or seven years. I have one on my '62, but it's coming off for HEI as soon as I get a spare 45 minutes. If I get a spare 15 minutes instead, the orange box is coming off and a better-quality Standard-Bluestreak unit is taking its place.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Yes, the 4 pin box can swap right into the old 5 pin harness without
any mods.
The old 5th wire is not used (often green color wire, blank spot on the newer EI box)
that runs to the 4 post ballast, the 4 pin EI box does not
need it.

It, however, does not work the other way....... if you
hook a 5 pin EI box into the 2 post ballast 'later system'
it will not work.....

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62 D100 225 3sp lwb
64 D100 A318 727pb custom lwb
66 D100 A318 4sp lwb
68 D100 B383 727 swb
65 Belveder A318 727 4d
65 Dart GT LA273 2bbl 904
73 Scamp 225 2bbl 4spOD
Old iron or no iron

Thanks Dan, i have heard of the problems with the mopar box's of late. I was running the echlin TP 50 but it went bad and had to go back to the stock box. I am only hoping to make a few passes down the track with orange box so we'll see how it goes, hope it last's longer than a few!!

TF

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Even in moderation i am excessive!