won't start

[big coop]

Hi. I have 115 hp mercury.no spark.I run the test I found on this sight no spark also don't know the year sn 4603535

 

[Plainsman]

Re: won't start

It's a 1977

do you have 12V to the red terminal on the switch box?

do you have 12v at the white terminal when the key is turned on?

MERCURY BATTERY-POWERED CDI SWITCHBOX TEST
FOR DISTRIBUTOR MODELS


This test is for the 332-2986 switchbox used from 1967-1978 on all the
inlines.

This test assumes your coil is good (most all are).


Disconnect the mercury switch (kill switch)

DISCONNECT BATTERY

1. Turn off ignion
2. Disconnect all 3 wires on the distributor side of the switchbox.
3. Remove the HV lead from the coil to the center cap (remember it unscrews
from cap)
4. Reconnect that HV center lead to the COIL side only.
5. Position that HV lead about about 3/8" from ground (block, shrouds etc)
and find a way to hold it there.
6. Jumper the brown and white terminals on the dist. side of the switchbox
together.

RECONNECT BATTERRY

7. Check that you have +12 V at red terminal.
8. Turn on ignition and verify +12V at white terminal (on red terminal side)
9. Touch the black terminal to ground - unit should cause spark each time
you touch ground.

If that passes and it won't fire at all, suspect the trigger.

Thanks to clams for the info

 

[big coop]

Re: won't start

Yes I have power on the red and the white

 

[big coop]

Re: won't start

and no spark from coil

 

[Plainsman]

Re: won't start

Then I'd say it's the switchbox. But I'd wait to see if a actual mechanic chimes in to be sure.

 

[big coop]

Re: won't start

ok thanks for the help

 

[Nickledimed]

Re: won't start

You also need a 75 CCA batt...just my 2 cents.

 

[big coop]

Re: won't start

what is a 75 cca batt and what do i do with it.

 

[Nickledimed]

Re: won't start

Here is a link to a thread about the battery for these 115 inline 6.
http://forums.iboats.com/showthread.php?t=296429

 

[Chris1956]

Re: won't start

Any standard marine starting battery will work with that inline. A 24 series is fine. Did you run the distributor spark test that was provided? Did it spark whenever you grounded the black terminal on the switchbox? If so, the trigger is likely bad. If not, something else is wrong.

 

[big coop]

Re: won't start

Yes i ran the provided tests, but i had no spark from the coil. I do not understand how disconnecting the distributor wires and touching the ground wire to the switch box will make the coil fire. I am trying to figure out whether it is the switch box or the trigger, but i do not understand this test. It does not make sense to me. The coil disconnected from the distributor, how the distributor can make it fire. Any help would be greatly appreciated.

Thank you