70 hp johnson don't fire

[joesteer]

i have a 1978 70 hp johnson that died, it just shut down like you turned off the key. ive checked the fire no fire from the plugs, or coils, ive gooten it to start once since then by turning the key all the way and holding it thier, but now that wont work, replaced ignision but that didnt help what shoud i check next

 

[Goodoleboy]

Re: 70 hp johnson don't fire

Welcome to the forum!<br /><br />My guess is that you still have a switch problem. Mabey grounded wire some place. Or one that is suposed to be grounded and has become lose and or corroed.<br /><br />Does your control box have a deadman kill switch. Suposed to have a lanyard tied to your belt when your driveng. <br /><br />Good luck!

 

[joesteer]

Re: 70 hp johnson don't fire

yes it has a deadman kill switch, checked it and it has no contanity when the butten is pushed in

 

[joesteer]

Re: 70 hp johnson don't fire

yes my control box has a deadman kill swicth but the switch seems to be working, any way to check and make sure, also could the starter sylonoid keep it from fireing

 

[ryan04]

Re: 70 hp johnson don't fire

As soon as you turn your key from ignition, power transfers through your solonoid and adds power to your starter which in turn makes your starter come to life. If you were able to turn the key before that one time and get going as long as the key was all the way over than I would be hesitant to beleive that it was your solonoid, but you never know if your getting nothing now than I guess it's always a possibiliy. I had the same problem with my rude about 2 months ago. All it was was one of my connectors on the ignition came undone just enough not to supply continuous power back to the engine, so I had to hold the key over in the start position and when it fired I had to keep the key in the start position for it to keep running.

 

[Goodoleboy]

Re: 70 hp johnson don't fire

Hold the button in and try starting it. Its suposed to be held in by some sorta key with the lanyard attached. the lanyard attaches to you.<br /><br /> Just incase you deside to junp out while cruesing down the river it will kill the engine.<br /><br />Solinoid is to jump heavy juice to starter thats its only job.<br /><br />Good luck!

 

[joesteer]

Re: 70 hp johnson don't fire

tryed holding in the button while trying to start still no fire, ive checked all ground wires that i can find, replaced ignision switch, is thier suposed to be a hot wire runing to the power pack, and if so does anyone know whicth one its suposed to be

 

[Goodoleboy]

Re: 70 hp johnson don't fire

Check the fuse near the starter, small red wire with rubber like bulb,if not their should be one someplace in the motor compartment. If this is blown nothing works but the starter. Ive blown mine with the tilt motor couple times.<br /><br />Good luck!

 

[willamettejeff]

Re: 70 hp johnson don't fire

I also have a 1978 70hp Johnson and actually if the fuse is blown the starter will not function. Also, there should not be any 12 volt source going to the ignition module (power pack) as it will damage the module. Your motor has a magneto ignition system and all voltages to run the motor are generated by a stator underneith the flywheel. The keyswitch and safety switch both stop the engine by grounding the black/yellow wire connected to terminal #6 (bottom/left side) of the ignition module killing the spark to the sparkplugs. So, the connection to the black/yellow wire needs to be open for spark to occur. BTW, this is why a standard ignition switch can't be used as it normally provides only a closed connection when turned on. Hope this helps.

 

[Goodoleboy]

Re: 70 hp johnson don't fire

You are correct Jeff if the fuse is blown the starter dosent engage. sorry bout that.<br /><br />Its bein a while since I had blown a fuse. That fuse kills everything. Tach. wont even jump back to zero, no dash lights no nutin.<br /><br />Good luck!