coil test?
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
Disconnect the coil from the truck entirely, connect one jumper lead from the positive side of the coil to the positive post on the battery, and connect another one to the negative side but keep the other end from touching anything.
Connect a wire to the high tension post on the coil, and put a spark plug on the other end. Lay the spark plug on something grounded.
Take the test lead that is connected to the negative post and tap it on the negative battery post. Do not hold it for more than a second on the battery. The spark plug should give a nice bright blue spark with a decently loud snap every time you lift the wire off the battery. If it does not, the coil is bad.
Connect a wire to the high tension post on the coil, and put a spark plug on the other end. Lay the spark plug on something grounded.
Take the test lead that is connected to the negative post and tap it on the negative battery post. Do not hold it for more than a second on the battery. The spark plug should give a nice bright blue spark with a decently loud snap every time you lift the wire off the battery. If it does not, the coil is bad.
And I have seen coils ohm out ok and still be bad, but only 3-4 in my 63 years.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Laughing Gas
Joined: Jul 1999
Posts: 1,047
Likes: 22
From: Lacey, WA
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Senior User
Joined: Jul 2015
Posts: 104
Likes: 0
My experience with bike & cars sites is that for every 100 peeps who post, only about 4 or 5 know what they are talking about. That is OK with me as long as its all positive but when it isn't, well life is too short to put up that cr@p. Google it.
Lead Driver
Joined: Jul 2011
Posts: 8,678
Likes: 191
From: On the Edge of the Desert
So you're upset with me because I told you to do something for yourself? Good lord....
The first time I needed to test a coil, I didn't know how. Guess what I did? Looked it up! I found out how to do it within a 5 minute window.
I told you yes, it can be done, and that you would need a multi meter. The "Google it" part was so you could figure out for yourself how exactly it is done, and what kinda resistance numbers you should be looking for. Had you done that, you would have figured it out a lot faster than waiting around here for someone to hand you an answer....
If trying to help you help yourself offends you, I do not apologize.
The first time I needed to test a coil, I didn't know how. Guess what I did? Looked it up! I found out how to do it within a 5 minute window.
I told you yes, it can be done, and that you would need a multi meter. The "Google it" part was so you could figure out for yourself how exactly it is done, and what kinda resistance numbers you should be looking for. Had you done that, you would have figured it out a lot faster than waiting around here for someone to hand you an answer....
If trying to help you help yourself offends you, I do not apologize.
Lead Driver
Joined: Apr 2011
Posts: 6,399
Likes: 40
From: El Dorado, Arkansas
I take of a lot of my time in an effort to try and help people with their problems (particularly as it relates to brake systems) because I have a great deal of experience with them and over the several decades I've fooled with them, I've encountered the same problems people post about and I know what the solutions for them were when I experienced them --it's the hard lessons that stick with you.
Kinda makes a person want to say "eff-it" when some body doesn't appreciate your time and your attempt to help sort out THEIR problems.
I could be doing other things or dedicating my time to someone else that actually appreciates it instead.
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Lead Driver
Joined: Apr 2011
Posts: 6,399
Likes: 40
From: El Dorado, Arkansas
So you're upset with me because I told you to do something for yourself? Good lord....
The first time I needed to test a coil, I didn't know how. Guess what I did? Looked it up! I found out how to do it within a 5 minute window.
I told you yes, it can be done, and that you would need a multi meter. The "Google it" part was so you could figure out for yourself how exactly it is done, and what kinda resistance numbers you should be looking for. Had you done that, you would have figured it out a lot faster than waiting around here for someone to hand you an answer....
If trying to help you help yourself offends you, I do not apologize.
The first time I needed to test a coil, I didn't know how. Guess what I did? Looked it up! I found out how to do it within a 5 minute window.
I told you yes, it can be done, and that you would need a multi meter. The "Google it" part was so you could figure out for yourself how exactly it is done, and what kinda resistance numbers you should be looking for. Had you done that, you would have figured it out a lot faster than waiting around here for someone to hand you an answer....
If trying to help you help yourself offends you, I do not apologize.
I guess I've been here long enough to know your nature and to know you weren't trying to be a smart *** in your response to him.
Thread Starter
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Senior User
Joined: Jul 2015
Posts: 104
Likes: 0
So you're upset with me because I told you to do something for yourself? Good lord....
The first time I needed to test a coil, I didn't know how. Guess what I did? Looked it up! I found out how to do it within a 5 minute window.
I told you yes, it can be done, and that you would need a multi meter. The "Google it" part was so you could figure out for yourself how exactly it is done, and what kinda resistance numbers you should be looking for. Had you done that, you would have figured it out a lot faster than waiting around here for someone to hand you an answer....
If trying to help you help yourself offends you, I do not apologize.
The first time I needed to test a coil, I didn't know how. Guess what I did? Looked it up! I found out how to do it within a 5 minute window.
I told you yes, it can be done, and that you would need a multi meter. The "Google it" part was so you could figure out for yourself how exactly it is done, and what kinda resistance numbers you should be looking for. Had you done that, you would have figured it out a lot faster than waiting around here for someone to hand you an answer....
If trying to help you help yourself offends you, I do not apologize.
Lead Driver
Joined: Jul 2011
Posts: 8,678
Likes: 191
From: On the Edge of the Desert
Originally Posted by ultraranger
I didn't perceive you were just blowing greasy rider off when you made the "google" it statement. I'm sure you could explain how to do it to him but, there are various write ups on the net already written out (and with diagrams) that explicitly shows how to check a coil. It would be faster for the OP to look up this information than the time (and space it would require) for you to write it all out here.
I guess I've been here long enough to know your nature and to know you weren't trying to be a smart *** in your response to him.
I guess I've been here long enough to know your nature and to know you weren't trying to be a smart *** in your response to him.
That's exactly right. Glad somebody understood it.
Posting Guru
Joined: May 2001
Posts: 1,395
Likes: 4
From: Cupertino
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