70 hp johnson not starting

[hpshadow]

hi i need some advice i have a 1980 70 johnson that i have wired to diffrent key switchs on the red plug harness and the motor cranks but will not start just pops off for a second when i unplug the harness and jump the motor it starts rite up it has spark and fuel when plugged to harness also no neutral safty switch or kill switch in harness is that the problem if it is how do i fix it if been messing with this for a week straight now its kiling me thanks help

 

[david_r]

Re: 70 hp johnson not starting

http://continuouswave.com/whaler/reference/wireColorCode.html#BW

http://continuouswave.com/whaler/reference/ignitionSwitch.html

these should help get you going.

what kind of controls are you using?

check out your wiring and see if you have the black wires crossed... or possibly the black/yellow wire may be bad, if the eng starts with the eng connector unplugged

 

[hpshadow]

Re: 70 hp johnson not starting

thanks for your help i will try that tomorrow and let you know david r thanks harry

 

[hpshadow]

Re: 70 hp johnson not starting

i tried running a separate black and yelloh rite to the teminal block stil does not start checked the key switch wiring again revesed black wires on m terminal do in need the neutral saftey switch couse all i got was the red plug harness no controls is there a circut i am missing to cause it not to start

 

[david_r]

Re: 70 hp johnson not starting

when you ground the black and yellow wire it kills the eng...... if it is bad it may have grounded somwhere and it wont let it fire.

you can bypass the neutral safety but be carefull in doing so...

have you checked ebay or anywhere for a remote control unit?..... new ones are outrageous but used ones are fairly cheap.

 

[david_r]

Re: 70 hp johnson not starting

what kind of switch are you using?....... is it aftermarket or oem?

 

[hpshadow]

Re: 70 hp johnson not starting

i have a omc and brand new sierra i have a omc kill switch and i have tried with it connected and witout it.

 

[david_r]

Re: 70 hp johnson not starting

if it starts by unplugging the red plug ,or the ignition sw in your case, it usually indicates a bad switch , wires on switch wrong, or bad wire from switch to plug.

so with everything hooked up correctly to the switch it will start for a second and die?........... or will it not even fire up?

 

[hpshadow]

Re: 70 hp johnson not starting

no it does not even start when hooked up and has weak spark the kill switch has 2 black and yellow wires and a black the drawing only shows blk yel to black yel on m on switch 1 wire and black to ground i don't know where other blk yellow goes

 

[david_r]

Re: 70 hp johnson not starting

if it has strong spark and starts with the red plug undone your problem is in the wires.

the extra blak and yellow wire on the kill switch is probably for it to wired in as an extra..... or it could be for a safety lanyard.

the ignition wiring diagram on continuous wave has all the extra switches but the onyl one you have to have is the ignition switch.

have you tried applying the accessory wire to the battery wire and touching the starter wire to see if your wires are good all the way to the switch?......... im thinking you may have high resistance in the wires coming from the plug to the switch since you have weal spark while the ign sw is hooked up.

are your wires shiny or black looking?

 

[hpshadow]

Re: 70 hp johnson not starting

they are shiny i cut back a foot to make sure no corrosion on motor and key harness

 

[hpshadow]

Re: 70 hp johnson not starting

thank u for all your help dave r are i did more volt test on the pins of the plug and i gues i had a boroken wire from the switch yellow and red to plug weak voltage jumping all over took wire from one of my merc harness on an i/o boat that was scap connected to solnoid to switch started rite up again thanks for the help

 

[david_r]

Re: 70 hp johnson not starting

are you wiring into the harness behind the red plug on the motor side or do you have a harness that plugs into the eng plug?

i have read about people having problems with aftermarket switches.... thats why i asked before if you had oem or aftermarket.

on mine you have to turn the key and then push in for the choke.. after that the eng will stop turning over and you have to kind of twitch your wrist and she will bust off....... i have had people try to start it but they couldnt figure out how to choke it and get it to turn over at the same time....... so i left it that way as an anti-theft measure........... mine is aftermarket too by the way.

im sure you have started over many times...... and i can see your frustration.

im a little stumped, maybe we are overlooking something..... the part that has me stumped is it runs without the connector plugged up, but has weak spark when the connector is plugged together..... it is possible you have a bad switch. i used to sell auto parts and i can tell you just because its brand new doesnt mean its good........ some things are made in the middle of the week and others are made on mondays and fridays, lol.

also how do you kill it when you jump it?.......... do you choke it out or use the black/yellow wire?

if we dont get it before long hang in there and someone will see our predicament and pipe in....... i just feel like we are overlooking something.

 

[hpshadow]

Re: 70 hp johnson not starting

i first tryed the omc key switch it checked out ok but i bought a sierra thinking that it was not getting full power across switch model mp41010 and worked fine i test ran and jump to start touching post on solonoid with my trigger start choked to shut off the red batt wire ahd yellow and red start wire must be broke in harness you got me i ran new wire now it runs fine choke turns on on the sierra switch cranks fine shuts off i even put on a kill switch that works got me what happened.

 

[david_r]

Re: 70 hp johnson not starting

glad to hear it......... i just noticed where you had told me you solved it.