1968 mecrusier problem

[sampler]

what is this engine telling me if this is the second coil assemmbly i have put in and it has alreary blow apart? why is this happening?

 

[Don S]

Re: 1968 mecrusier problem

What engine are we working on?

First thing I would be checking is the voltage to the coil with the engine running around 1500 rpm. If the alternator is defective you could have a very high voltage going to the coil.

 

[sampler]

Re: 1968 mecrusier problem

What engine are we working on?

First thing I would be checking is the voltage to the coil with the engine running around 1500 rpm. If the alternator is defective you could have a very high voltage going to the coil.

its in-line 6. also iam nit able to get motor to start runningit cranks over but will not start. but i went back out the after noon and for thatthe coil i just put on yesterday had already blow up. also it is a brand new alternator.

 

[roamrocker]

Re: 1968 mecrusier problem

I would look into the possibility of there being a bad ground to the coil.

 

[Bifflefan]

Re: 1968 mecrusier problem

If the coil is accually exploding, you have voltage going to it all the time, even with the key off.
Turn off the key and check the pos wire for voltage, there should be none. with the key on you should have about 9 volts, and cranking you should have 12 volts.

 

[sampler]

Re: 1968 mecrusier problem

I would look into the possibility of there being a bad ground to the coil.

there should be a ground wire from the disbuter to the coil and a ground wire to neg of battery

 

[sampler]

Re: 1968 mecrusier problem

If the coil is accually exploding, you have voltage going to it all the time, even with the key off.
Turn off the key and check the pos wire for voltage, there should be none. with the key on you should have about 9 volts, and cranking you should have 12 volts.

what should i do if there is power there all the time?

 

[Don S]

Re: 1968 mecrusier problem

there should be a ground wire from the disbuter to the coil and a ground wire to neg of battery

There is no such thing as a ground wire for the coil.
The + terminal is voltage in, the - terminal is for power out to the distributor. That is it. If you have a wire going to ground, then that is why your coil is blowing up and the engine won't start.

 

[sampler]

Re: 1968 mecrusier problem

There is no such thing as a ground wire for the coil.
The + terminal is voltage in, the - terminal is for power out to the distributor. That is it. If you have a wire going to ground, then that is why your coil is blowing up and the engine won't start.

so there should be only one wire from the -terminal to the distributor.and know other wire should be there.

 

[Don S]

Re: 1968 mecrusier problem

The only other wire to the - terminal would be the wire to the tachometer. Not sure what color it was in 68. Might disconnect the tach lead and see if it will run. A shorted tach can cause problems.

 

[sampler]

Re: 1968 mecrusier problem

The only other wire to the - terminal would be the wire to the tachometer. Not sure what color it was in 68. Might disconnect the tach lead and see if it will run. A shorted tach can cause problems.

ok i hear that but what if there is power to the coil if the key is off. i trace the wire +wire off the coil and it goes the starter. but not where u hook up the battery to. a differnt part of the starter. should the +connection on the coil have 12v to it if the key is off?

 

[Don S]

Re: 1968 mecrusier problem

should the +connection on the coil have 12v to it if the key is off?

No

check your battery cable where it attaches to the starter. See if it is touching the small terminal on starter solenoid.

 

[sampler]

Re: 1968 mecrusier problem

No

check your battery cable where it attaches to the starter. See if it is touching the small terminal on starter solenoid.

If there is no touching on the small terminal and i still have power coming out that small terminal. does that mean i have a internal problem with the starter motor?

 

[Don S]

Re: 1968 mecrusier problem

That is one of the possibilities. but not the only one.

 

[sampler]

Re: 1968 mecrusier problem

That is one of the possibilities. but not the only one.

if not the start is not the problem what else would give 12v out of the starter motor that shouldnt give me 12v with the key off?

 

[Bifflefan]

Re: 1968 mecrusier problem

You ign switch could also be letting power go through.
Maybe it is not wired right?
Most important is not to have power at the + term on the coil when it not running.
Then look at a wiring diagram and start tracing wires.

 

[Don S]

Re: 1968 mecrusier problem

If the cable is not touching, disconnect the main engine harness and see if the power is still on. Then we will at least know which direction to go. Don't want to sit here all day typing every possible thing that could happen.

 

[sampler]

Re: 1968 mecrusier problem

If the cable is not touching, disconnect the main engine harness and see if the power is still on. Then we will at least know which direction to go. Don't want to sit here all day typing every possible thing that could happen.

sorry don really appercrate all the help you have giving me today. this is what i found that the battery wire was rubbing on the small termerial so i fix that. now there is no power there know. now i try to start motor and it still wont start. i put a jumper from where the battery hooks up to the small termerial and turned the key and the motor turns over. take jumper off and motor will not start. so my problem is in the starter? I also check for power on the small termeiral when i turn the key and got no power out the small termeiral

 

[Don S]

Re: 1968 mecrusier problem

Lets get the terminology straghtend out first.
Cranking= motor turning over with starter but not running
Starting = motor runs.
You crank the motor till it starts.

this is what i found that the battery wire was rubbing on the small termerial so i fix that. now there is no power there know.

What I expected and why I didn't want to type all the possibilities.

now i try to start motor and it still wont start.

Is it cranking and not starting, or not cranking. Big difference and why I started with the terminology.

Do you have spark ????? I doubt it. since the starter had power to the coil all the time and finally blew the coil up, I would bet money the points and condenser are all fried also. Replace them, set the dwell and bet it will start.

 

[sampler]

Re: 1968 mecrusier problem

Lets get the terminology straghtend out first.
Cranking= motor turning over with starter but not running
Starting = motor runs.
You crank the motor till it starts.



What I expected and why I didn't want to type all the possibilities.


Is it cranking and not starting, or not cranking. Big difference and why I started with the terminology.

Do you have spark ????? I doubt it. since the starter had power to the coil all the time and finally blew the coil up, I would bet money the points and condenser are all fried also. Replace them, set the dwell and bet it will start.

It will not crank when i turn the key know. But put a jumper wire from the battery termial to the small termial and turn the key and the motor starts cranking. but the motor still will not start. so since i had to jump starter is the starter bad .