Switch boxes

**buzmacdowell** · 11-25-2020, 07:48 PM

I saw a drag boat a few days ago and it had blue switch boxes...anybody know anything about them?

**Merc 2.5** · 11-25-2020, 08:15 PM

Merc race boxes, came stock on 245, 260s etc. Little diffrence not much

**godspeed** · 11-25-2020, 08:23 PM

While on subject can you still get good mercury switch boxes for older v6 mercs?

**FORBESAUTO** · 11-25-2020, 09:30 PM

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CDI also offers a blue “racing” switchbox and hi-po stator. I’ve had decent luck with them, are a good oem replacement option. Had one set of switchboxes with a bad bias circuit that caused me some grief, but otherwise been good. The Sierra boxes are also a good option.

**H2Okie** · 11-25-2020, 10:27 PM

Summit racing sells Sierra (formerly Mallory ) Mercury V6 switch boxes and spark coils or at least they did a year ago when I purchased both for an older 200 EFI motor I have .

**nelson edens** · 11-26-2020, 07:01 AM

These are the Sierra/Mallory from Pro Marine

http://parts.promarineusa.com/produc...l/M50/1/1/5775

**mercrazy** · 11-26-2020, 09:20 AM

anybody tried the chinese ebay switchbox for $20 each?

**buzmacdowell** · 11-26-2020, 01:04 PM

I have two still in the box in my cabinet...just don't have the balls to try them yet...getting closer though...

**XstreamVking** · 11-26-2020, 01:21 PM

You would trust a 20 buck chinee box that could cause a problem with your expensive elec system and even melt the pistons? I would heave those things. I still put out the bucks for orig merc stuff.

**Dave S** · 11-26-2020, 01:27 PM

$$20 switch box= $$4 blown motor.I new a guy that bought the cheep ones.......so their New..... no spark......changed every thing.....still no spark..... put on used box and had spark. I think on the cheep ones there are just studs to hold the nuts on.......

**FORBESAUTO** · 11-26-2020, 02:12 PM

Don’t like to use anything with China on it, have had no luck with any of it from automotive to kids toys. Always found to be junk, you get what you pay for. Had a buddy try one of the value line voltage regulators from pro marine, lasted about a month and caught fire, luckily he checked on it when tach went crazy, or it was about to get really bad. Bias circuit goes to crap in the switchboxes and ya got yourself a melted piston, not worth it IMO.

**BUZZIN' DOZEN** · 11-26-2020, 05:20 PM

Originally Posted by nelson edens

These are the Sierra/Mallory from Pro Marine

http://parts.promarineusa.com/produc...l/M50/1/1/5775

These are made in Germany by Prufrex

**mercrazy** · 11-27-2020, 11:10 AM

is there a schematic and parts list available for these?
i can build circuit boards.

**H2Okie** · 11-27-2020, 03:43 PM

Originally Posted by mercrazy

is there a schematic and parts list available for these?
i can build circuit boards.

What you're suggesting would be the best use for the cheap Chinese knock-off switch boxes . Just do what the Chinese do and disassemble it and reverse engineer it using high quality electrical components instead .
I suspect the SCR /Thyrister inside that fires the spark coil is a specialized type device such as a GTO SCR .
Summit sells the Sierra boxes for $152 each with free shipping so for me it wasn't worth the risk of using an incorrectly rated component and having a meltdown .