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the serial number is not consistent with johnson serial numbers as all have 2 letters followed at the end by 2 numbers which indicates the year of manufacturer 9 ( ft17598 indicates it was mahe in 98)
There are pages on the net explaining when a serial number is used but it must be old as johnsons have used model numbers for identification since 1960's
probably better if you take it to a johnson service dealer as they may have the johnson factor list for serial numbers as you will have to identify it to get parts
go google and type in manufacture date of 40s johnson td 20 outboard serial number 63191
if that shows no results just cahange some words in the search
10 volts isn't good and if you have a weak connection, it won't turn it over. You should have 12+ from a good battery. Try cleaning the battery connections with a battery brush.
By reading this.. I am assuming #3 is the crank battery....
Try this.. (from experience) remove all wires (or big terminals) from the battery and see how that works.. I have a 3 bank and use a stand alone charger!! Works BETTER!!!
wont crank or wont start.?? no car starts , if it cant crank. (unless push starter (M/T magic) that is not a trans sensor its the PRN switch. ill answer for, wont CRANK ! it wont crank even with a good battery (charged) or jump started. 1: bad start 2: bad wires to same. so hot wire the starter small wire, the key start line is tiny. cranks. , starter good, no crank starter bad or cables bad. if it cranks hot wired, then the key line is dead. easy, huh?
If you put a new battery in the boat then look around the battery and make 100% sure that you hooked up ALL of the accessory wires to both NEG and POS posts. Sounds dumb but I have come accross it multiple times. As for the engine, if it turns over but will not start then I am about 80% sure that you need to have your carbs cleaned. Fuel sits in the bowl of the carb, then after about 30 days starts to varnish, after varnish it starts to look like mollasses. Then spring comes around and you squeeze the fuel bulb and crank it over forcing that old **** into your idle jets. That is why it is really a good idea to have your carbs fogged before you store your boat for the winter.
have you checked all ofyour fuses? usually when you hook up a battery backwads you end up blowing a fuse and or fry your alternator on older modeled vehicles as there is no protection for it.
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