Hi All,
I have a 71 merc 800 serial 3052172.
It stood for a number of years,i got it going, it ran good eventually....
I ran it with a maintenance free car battery to try it out.
i ran it for 4 or 5 mins fine, then i switched it off by choking it. the kill switch was duff.
Since i stopped it i no longer get spark at all? i get nothing as far back as the coil..
I've read a lot hear on iboats, very useful!
i read through the ignition checks to do.
I get 12.8V at the red on the switchbox all the time.
I get 12.8V on the White when i switch to run.
when i crank it it drops to 9V
and as i said i get nothing on the lead from the coil.
Is there some way i can test the green wire to see if the power to the coil is good? i don't know anyone with peak voltage reader? can i do it with my multimeter?
The coil has quite a few cracks in what look like the magnets around it? they were there before though when it was running fine so i'm not really suspecting that as the fault?
i tested the resistance of the coil and it seems ok but a little wierd?
could running maintenance free batt or just the batt being a bit crappy charged cause this sudden loss of spark?
could i have toasted the switchbox running it for 4-5 mins? i would have thought if switchbox was toast it would have stopped on its own, and not by me stopping it?
thanks for your help.
Phil
I have a 71 merc 800 serial 3052172.
It stood for a number of years,i got it going, it ran good eventually....
I ran it with a maintenance free car battery to try it out.
i ran it for 4 or 5 mins fine, then i switched it off by choking it. the kill switch was duff.
Since i stopped it i no longer get spark at all? i get nothing as far back as the coil..
I've read a lot hear on iboats, very useful!
i read through the ignition checks to do.
I get 12.8V at the red on the switchbox all the time.
I get 12.8V on the White when i switch to run.
when i crank it it drops to 9V
and as i said i get nothing on the lead from the coil.
Is there some way i can test the green wire to see if the power to the coil is good? i don't know anyone with peak voltage reader? can i do it with my multimeter?
The coil has quite a few cracks in what look like the magnets around it? they were there before though when it was running fine so i'm not really suspecting that as the fault?
i tested the resistance of the coil and it seems ok but a little wierd?
could running maintenance free batt or just the batt being a bit crappy charged cause this sudden loss of spark?
could i have toasted the switchbox running it for 4-5 mins? i would have thought if switchbox was toast it would have stopped on its own, and not by me stopping it?
thanks for your help.
Phil