Mark 58 ae

Outboard Related Only
Scratcher
Posts: 2
Joined: Wed Aug 29, 2018 1:34 pm

Mark 58 ae

Postby Scratcher » Thu Sep 13, 2018 6:40 pm

Hi guys. Newbie here looking for help with going through a mark 58a. I have the following wiring harness https://maxrules.com/oldmercs/Wiring/0_1965a/3.pdf. Was wondering if I can “Hotwire” it to check for spark and compression. I don’t have the control box or switch. Haven’t spent much time staring at the wiring diagram but was wondering which wires to connect to turn it over and get juice for spark. Or is there a simpler way I’m not thinking of? Probably is, I’m kinda slow sometimes. Thanks for any help

RCO
Posts: 47
Joined: Sun Jun 11, 2017 4:37 pm
Location: MN

Re: Mark 58 ae

Postby RCO » Thu Sep 13, 2018 8:36 pm

As long as the switch is not installed you can just power up the starter. Magneto ignition is self energizing, no external power needed. Be careful though, if it does start you have no way to turn it off.

Scratcher
Posts: 2
Joined: Wed Aug 29, 2018 1:34 pm

Re: Mark 58 ae

Postby Scratcher » Thu Sep 13, 2018 9:08 pm

Ok I was thinking that there was a kill switch to magneto that had to be dealt with. So what happens to that wire going to magneto when the ignition is off? It is grounded when key off, right? Is the automatic choke energized when in start but then circuit broken when key in run? Also I should ground plugs or wires when doing compression check, right? Thanks for your help, I’m a little rusty.....

2Fast4Me
Posts: 123
Joined: Sat Apr 18, 2015 8:43 am
Location: SW Wisconsin

Re: Mark 58 ae

Postby 2Fast4Me » Thu Sep 13, 2018 10:08 pm

Ground the magneto at the distributor to kill the engine.

Dave Bernard
Posts: 742
Joined: Wed Mar 11, 2015 12:00 pm

Re: Mark 58 ae

Postby Dave Bernard » Thu Sep 13, 2018 10:11 pm

choke must be energized to work use the manual choke.

2Fast4Me
Posts: 123
Joined: Sat Apr 18, 2015 8:43 am
Location: SW Wisconsin

Re: Mark 58 ae

Postby 2Fast4Me » Fri Sep 14, 2018 6:35 am

Sorry i should have said ground the magneto "P" lead to kill the engine.


Return to “Ask A Member”

Who is online

Users browsing this forum: No registered users and 4 guests