Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
posted to rec.boats
external usenet poster
 
First recorded activity by BoatBanter: Jul 2006
Posts: 7
Default 74' merc 150 no fire. help?

this motor ran last year but i just got it out and it wont start.

it looks like i got no spark. i have checked for power at the switch
box and it seems to be ok.

i see three parts in this ignition system. are there any tests i can do
to narrow it down?

thanks
john

  #2   Report Post  
posted to rec.boats
external usenet poster
 
First recorded activity by BoatBanter: Jul 2006
Posts: 294
Default 74' merc 150 no fire. help?


wrote in message
s.com...
i see three parts in this ignition system. are there any tests i can do
to narrow it down?

thanks
john



MERCURY BATTERY-POWERED CDI SWITCHBOX TEST
FOR DISTRIBUTOR MODELS - EDITED BY CLAMS CANINO

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 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 this passes and it still won't fire at all, suspect the trigger
(distributor).



To test replacement trigger if/when switchbox passes test: Remove jumper
wire and hook up the 3 wires from the new distributor to the switchbox, turn
on key and manually spin the distributor, spark should jump from coil wire
just like in the switchbox test.


POST BACK HERE IF YOU NEED A USED SWITCHBOX OR DISTRIBUTOR.

-Wayne






  #3   Report Post  
posted to rec.boats
external usenet poster
 
First recorded activity by BoatBanter: Jul 2006
Posts: 7
Default 74' merc 150 no fire. help?

thanks for the info!!!!

i will test it and report back.

john


Clams Canino wrote:
wrote in message
s.com...
i see three parts in this ignition system. are there any tests i can do
to narrow it down?

thanks
john



MERCURY BATTERY-POWERED CDI SWITCHBOX TEST
FOR DISTRIBUTOR MODELS - EDITED BY CLAMS CANINO

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 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 this passes and it still won't fire at all, suspect the trigger
(distributor).



To test replacement trigger if/when switchbox passes test: Remove jumper
wire and hook up the 3 wires from the new distributor to the switchbox, turn
on key and manually spin the distributor, spark should jump from coil wire
just like in the switchbox test.


POST BACK HERE IF YOU NEED A USED SWITCHBOX OR DISTRIBUTOR.

-Wayne


  #4   Report Post  
posted to rec.boats
external usenet poster
 
First recorded activity by BoatBanter: Jul 2006
Posts: 294
Default 74' merc 150 no fire. help?

OK.. report back??

-W

wrote in message
oups.com...
thanks for the info!!!!

i will test it and report back.

john


Clams Canino wrote:
wrote in message
s.com...
i see three parts in this ignition system. are there any tests i can

do
to narrow it down?

thanks
john



MERCURY BATTERY-POWERED CDI SWITCHBOX TEST
FOR DISTRIBUTOR MODELS - EDITED BY CLAMS CANINO

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 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 this passes and it still won't fire at all, suspect the trigger
(distributor).



To test replacement trigger if/when switchbox passes test: Remove

jumper
wire and hook up the 3 wires from the new distributor to the switchbox,

turn
on key and manually spin the distributor, spark should jump from coil

wire
just like in the switchbox test.


POST BACK HERE IF YOU NEED A USED SWITCHBOX OR DISTRIBUTOR.

-Wayne




  #5   Report Post  
posted to rec.boats
external usenet poster
 
First recorded activity by BoatBanter: Jul 2006
Posts: 7
Default 74' merc 150 no fire. help?

i spent a little time with it last night.

i unhooked the coil wire and it was extreemly croaded at the coil end.
so i tryed cleaning it and the in side of the coil too.

i thought for sure i found the problem so i tryed to start it after
cleaning.
still nothing.

i am going to try your test this weekend. i am guessing this coil is
junk.
any chance you got ohm specs for it?

thanks
JOHN


Clams Canino wrote:
OK.. report back??

-W

wrote in message
oups.com...
thanks for the info!!!!

i will test it and report back.

john


Clams Canino wrote:
wrote in message
s.com...
i see three parts in this ignition system. are there any tests i can

do
to narrow it down?

thanks
john


MERCURY BATTERY-POWERED CDI SWITCHBOX TEST
FOR DISTRIBUTOR MODELS - EDITED BY CLAMS CANINO

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 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 this passes and it still won't fire at all, suspect the trigger
(distributor).



To test replacement trigger if/when switchbox passes test: Remove

jumper
wire and hook up the 3 wires from the new distributor to the switchbox,

turn
on key and manually spin the distributor, spark should jump from coil

wire
just like in the switchbox test.


POST BACK HERE IF YOU NEED A USED SWITCHBOX OR DISTRIBUTOR.

-Wayne





  #6   Report Post  
posted to rec.boats
external usenet poster
 
First recorded activity by BoatBanter: Jul 2006
Posts: 294
Default 74' merc 150 no fire. help?

I don't have the ohm specs off hand. Assume that a dead open circuit means
bad coil though.

The coil on those is the LAST item to suspect. The switchbox or trigger is
most likely. I havn't see a bad coil on one of those in over 5 years... and
that's saying something.

-W (is yours the big orange coil or the smaller one that mounts to the
block?)


wrote in message
oups.com...
i spent a little time with it last night.

i unhooked the coil wire and it was extreemly croaded at the coil end.
so i tryed cleaning it and the in side of the coil too.

i thought for sure i found the problem so i tryed to start it after
cleaning.
still nothing.

i am going to try your test this weekend. i am guessing this coil is
junk.
any chance you got ohm specs for it?

thanks
JOHN


Clams Canino wrote:
OK.. report back??

-W

wrote in message
oups.com...
thanks for the info!!!!

i will test it and report back.

john


Clams Canino wrote:
wrote in message
s.com...
i see three parts in this ignition system. are there any tests i

can
do
to narrow it down?

thanks
john


MERCURY BATTERY-POWERED CDI SWITCHBOX TEST
FOR DISTRIBUTOR MODELS - EDITED BY CLAMS CANINO

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 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 this passes and it still won't fire at all, suspect the trigger
(distributor).



To test replacement trigger if/when switchbox passes test: Remove

jumper
wire and hook up the 3 wires from the new distributor to the

switchbox,
turn
on key and manually spin the distributor, spark should jump from

coil
wire
just like in the switchbox test.


POST BACK HERE IF YOU NEED A USED SWITCHBOX OR DISTRIBUTOR.

-Wayne




Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Looks like they got the engine to fire, alright Chuck Gould General 2 July 7th 06 01:46 AM
About that boat fire Booby doubted Capt. Neal® ASA 5 December 20th 04 02:46 AM
Dealing with a boat fire, checking for a common cause Gould 0738 General 14 November 5th 03 01:13 PM


All times are GMT +1. The time now is 06:51 AM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 BoatBanter.com.
The comments are property of their posters.
 

About Us

"It's about Boats"

 

Copyright © 2017