2.4 switchboxes keep going bad.

[1st check]

ok thanks or all the replies! i have been told twice today that you can burn up switch boxes by cranking on a low battery????? i have done this tooooo many times

[j_martin]

ok thanks or all the replies! i have been told twice today that you can burn up switch boxes by cranking on a low battery????? i have done this tooooo many times

Don't make any sense to me, but then what do I know?

John

[Steve Pope]

Does this engine have an idle stabalizer/spark advance box fitted. If so disconnect and/or discard it. This could be causing the repeated switch box failure.Also, these boxs have been known to detonate pistons through over advanceing ignition timing.Popey

[ivlakeman]

I have two switchbox's testing at 1410 and 1413 would this be a problem little over cdi testing specks of 1400 eBay boxes

[Merc 2.5]

Fwiw. If u replaced 3 then u not replacing them in pairs and ur chasing ur tail. Get 2 new Sierra boxes also need check conditions of wire from stator and trigger. If hard and brittle and missing pieces, should b replaced

[Capt.Insane-o]

You need to check to see if your getting any voltage to the black and yellow wires when you cycle the key switch.

[ChrisCarsonMarine]

[QUOTE=Capt.Insane-o;3276622]You need to check to see if your getting any voltage to the black and yellow wires when you cycle the key switch.[/QUOTE
Yes!!! ,anything over .4 volts on the kill circuit,at any time...on off cranking or priming can destroy the switchboxes.Brass throwoff inside the back of the keyswitch from arcing builds up over time and becomes a semi-conductor dust...worse when you add dew or rain,Chris

[ivlakeman]

[QUOTE=ChrisCarsonMarine;3276949]

You need to check to see if your getting any voltage to the black and yellow wires when you cycle the key switch.[/QUOTE
Yes!!! ,anything over .4 volts on the kill circuit,at any time...on off cranking or priming can destroy the switchboxes.Brass throwoff inside the back of the keyswitch from arcing builds up over time and becomes a semi-conductor dust...worse when you add dew or rain,Chris

IF your ordered a new key switch it would come from China I'm sure ....so what's the fix to this problem ???????????????

[Capt.Insane-o]

Aircraft quality toggle switches

[XstreamVking]

Here's some American made stuff...https://www.sherco-auto.com/battery-...-switches.html

[ivlakeman]

my black yellow tested zero 0 with key off at the box

[ChrisCarsonMarine]

my black yellow tested zero 0 with key off at the box

check for voltage while someone puts the switch through its paces...off on prime crank position with starter disconnected (cranking over will mane power)Chris

[ivlakeman]

OK thanks...... I'm running your reeds and stuffers in a 1991 14 pedal motor best move I have made big improvement in power top and bottom RPM

[ivlakeman]

I have a 10 wire key switch that's no longer available if I need to cut the wire to put it on a switch will it be the black/yellow wire that run to the two switch boxes its on the key switch and its not a hot wire it must be a ground ??????????????