3.0L coil

biggjimm

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I took my coil off & it has a couple markings on it, one is 081 & the other is 6v. Surely this isn't a 6 volt coil?
 

biggjimm

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Father n law said he remembered getting this coil from the salvage yard (yes, he's that much of a tightwad & I tried to explain to him you can't just pick one up off the ground & put on there) so who knows what it's off of. But I've got a new Sierra coil coming from Napa in the morning so I'll see where that gets me.
 

stonyloam

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Make sure the wire that goes from the coil - to the distributor has a good solid clean connection. That is your ground and you need a good connection to get good current flow through the coil. Good luck.
 

biggjimm

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I checked the wire going to the points & it is good & clean & tight.
So I put new coil on. I've got 4v with the key on & that drops to around 1v while cranking, so I'm not getting anything from the solenoid. I jumper 12v from the battery to the coil + & still have no spark. Replaced points & condenser the last time we ran it & it ran find then. Checked the gap & it's right on the money. They're clean & pit free just like new. Could the condenser be bad? I'm going thru the troubleshooting sticky again now that I have it narrowed down.
 

biggjimm

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I found a guide on testing the coil & it said with my meter set on the 20k setting, the resistance on the secondary side of the coil (red lead on coil + & black lead on coil tower) should read 11.0 or higher with 13.9 being normal & I've got 8.87 on my brand new coil. Do I need another coil? The primary side tested fine at 1.6 on the 200K setting.
 

stonyloam

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OK, take all of the wires off the coil. Run 12v jumper to the coil +. take a piece of insulated wire and strip some insulation off of both ends. Attach one end to the coil -, and briefly ground the other end to bare engine metal. You should see a little spark when you ground the wire, and see a spark from the coil center wire when you remove the wire. If you do your coil should be OK.
 

stonyloam

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If the coil test is ok, put the wire that goes to the distributor back on and try jumpering across the points again. You could try disconnecting the condenser. It seems you are not getting full voltage from the ignition switch, and you have a bad starter solenoid connection. The condenser is there to absorb the voltage spike being fed back through the primary, and prevents arcing across the points.
 
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biggjimm

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I'll do that just to verify my coil is working properly. I know I've got a problem with the starter solenoid not sending power & there seems to be something wrong coming from the key switch, possibly with the resistor itself? But I've jumpered 12v to the coil + with no other wires on the + side & only the distributor wire on the - side & still nothing. I guess I can a set of points & condenser but I don't think there's anything wrong with them. At least with the points that is. I'm going to address the other problems but it should fire with a jumper wire to the coil & it's just got me baffled. I've disconnected the tachometer & the interrupter switch as well as the + side wires in case there's a short in one of those & still nothing. I think I'm gonna take the other boat that does run & some fishing poles & go to the lake tomorrow after church. Thanks again stonyloam. Jim.
 

biggjimm

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Ok, this was really bothering me after my last post because like I said it has to spark if everything is in order. So I checked the coil just now in the dark & I got a nice little spark when I ground the - terminal but nothing when I removed it. I even got brave & held the coil wire in my hand. That's when it dawned on me, don't overlook the simple things, that's usually where the problem is & pulled the coil wire off & got my ohm meter & nothing. Looked down in the terminal & it's all gooey & the little graphite looking wire is deteriorated & not touching the brass terminal. Imagine that, a bad coil wire. Now I can move on to the other problems as I'm guessing I get a new coil lead tomorrow & it'll spark like the 4th of July. Why we always complicate things & overlook the little easy is beyond me. Thanks stonyloam for your help & patience.
 

biggjimm

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Jul 15, 2015
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Got a new coil wire & still nothing, only thing left is points & condenser. The cap & rotor have some deposits on them & I found a "tune up kit" that has new cap, rotor, points & condenser for like $27 so it'll be here first thing in the morning. That'll pretty much make everything new. If it doesn't fire now, I'm getting out the dynamite.

As far as the test procedure I found for the coil that said it was bad, I went back to Napa & we called the manufacturer technicians & they said the #'s I got when testing it were perfect for a coil with an external resistor & we checked about 5 different coils on the shelf & they all tested the same as mine.
So we'll see what the tune up kit does for it in the morning. Jim.
 

Bondo

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only thing left is points & condenser.

Ayuh,..... Considerin' those are Annual maintenance parts, ya shoulda Started there,.....
 

biggjimm

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Jul 15, 2015
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I know it bondo. Beings the points were replaced the last time we ran it & didn't have more than about 3hrs run time on them & cap & rotor weren't bad enough to keep it from running (or so I though) and as I said before about my tendency to look beyond the small things for the big, difficult problem, I figured it was something else. But long story short, I've got a fresh tune up now. I've still got the issue of no power from the solenoid to the coil & I'm doing that tomorrow. What I think the major problem was A) weak coil, B) bad coil wire & C) the rotor. When I got the dwell set & put the new cap on, I put it down on the distributor into position & when I let go of it to grab my screwdriver, the cap popped back up a bit from the spring pressure on the new rotor & the old cap never did that so when I compared rotors, the little doo-dad on the top of the rotor that contacts the coil wire input terminal was tweaked & soft & wouldn't stay sprung up against the cap tight which had led to some carbon build up on the underside of the cap. So once again, the small overlooked things turn out to be the big, difficult problem. She purrs like a kitten now after I jumper 12v to the coil so tomorrow I have a date with the starter solenoid & then put the outdrive back on & now that the lake levels are down close to summer pool, take her back out & get her wet once again!

Thanks to all that helped & offered their advice while I had my refresher course in breaker points ignition systems. I love maintaining & fixing my own stuff & am always up for a challenge & this was certainly a bit of a challenge at times but if I remember to just slow down & take a look at what's going on & stop overlooking the little simple things it makes things go much smoother. Thanks again. Jim.
 
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