no spark on 115hp red band

[115hp redband]

Hi, i have been given this 115hp red band straight 6, not sure what year it is, it has been laid up for a long while, but i think it was serviced before it was laid up the spark plugs are brand new, the anode is spotless.

after a few hours of tinkering i finally got her turning over of the starter motor, went to check if she was sparking and nothing happening, i have checked the distributor and cleaned the relevant bits, there are no points but a disc with holes in it im assuming that this is what distributes the spark.

any ideas on how check the coil and so on.

i am stuck at this point so please any advise will be gratefully received

Dean

 

[Chris1956]

Re: no spark on 115hp red band

Dean, That ign system needs to have +12VDC on the red wire and the white wire on the non-dissy side of the switchbox. The white wire comes from the ign keyswitch, and is switched voltage. The red wire is always hot.

There is a FAQ with a Dissy Ign test procedure. I suggest you find it an dtry it.

 

[emckelvy]

Re: no spark on 115hp red band

Here ya go:

MERCURY BATTERY-POWERED CDI 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 (problems with CDI coils are rare).

DISCONNECT BATTERY

1. Turn off ignition;

2. Disconnect all 3 distributor wires on the Port side of the switchbox (and the ?mercury switch? if present);

3. Remove the HV lead from the ign coil to the center of the dist. cap (remember it unplugs from the coil and unscrews from the cap);

4. Reconnect the HV lead to the COIL only;

5. Position the free end of the HV lead approx. 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 to each other.

RECONNECT BATTERY

7. Check that you have +12V at the red terminal (even with the ign off);

8. Turn on ignition and verify +12V at the white terminal (same side as the red terminal);

9. Ground the black terminal on the distributor side of the switchbox - this should cause a spark each time you touch ground.

If you get spark with the distributor bypassed, and it won't fire with the distributor connected, the trigger is bad and the entire distributor housing assy must be replaced.

If you get no spark using the test, the switchbox is probably bad. In that case, be sure to check for correct power on the switchbox, check all connections, and check the coil's resistance to make sure it's OK.

 

[115hp redband]

Re: no spark on 115hp red band

Thank you for the info fellas, i will get onto it today and let you know how it goes.

Cheers Dean.