Help!Please!No coil voltage Dodge p/u - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 06-26-2005, 03:03 PM
Early Iron or No Iron
 
Join Date: Mar 2005
Location: Sundre,Alberta,Canada
Age: 43
Posts: 39
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Help!Please!No coil voltage Dodge p/u

I have a '84 Dodge 1/2 ton with the leaning tower of power and Chrysler's "advanced" version of the stinkin' Lean-burn setup.I shut the ol' girl off during a torrential downpour last weekend,and it wouldn't restart.I ran through the usual diag,no spark,and nothing at the positive side of the coil.I ran a jumper from the battery to the coil and she fired right up so I could at least get it the 10 blocks home.More tests per the factory service manual indicated power to the ign switch,but nothing out to the coil.I replaced the ign switch,same thing.The tests indicated the module was good,but I tried two others anyway (by this point,I am MUCH balder than when I began).I enjoy a good mystery now and then,but I like to know there's an answer at the end.One of you guys has got to have a couple more ideas,I'm out.Please help before I light this thing on fire.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-26-2005, 08:48 PM
docvette's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Rebuild an alternator Last photo:
Join Date: Mar 2004
Location: Lafayette, california
Age: 62
Posts: 7,362
Wiki Edits: 12

Thanks: 0
Thanked 6 Times in 3 Posts
Coil Power

Doc here,

Dude, The Butler did it.....

Not familiar with that version of the system, BUT let's try Some generic troubleshooting...

Does that have a resistance wire, or Coil resistor...If so with a volt ohm meter, read power on each side of it..Should be 12 volts coming from the Ignition switch side and 6 to 9 on the coil side..If you have 12 volts and 0 on the other side, then It's open...replace the resistor or wire.

If you have NO 12 volts...back track that wire until you find 12 volts...Or at the Ignition switch, whichever occurs first...replace that which lies between...

Do you have a fuse inside or under the hood Marked ECM, Coil or Computer? Check those...

By virtue of the fact it runs in "Bypass Mode" shows that the Ignition is functioning...just not receiving power...

Try those and let us know what you find...

Doc
__________________
Aftermarket Solutions
Electronic & Electrical
Innovations
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-26-2005, 08:54 PM
Rob Keller's Avatar
AKA:"SLOWRIDE66"take it easy!
 
Last wiki edit: How to post pictures on a forum
Last journal entry: 85 Suburban
Last photo:
Join Date: May 2004
Location: Central Florida U.S.A.
Age: 48
Posts: 4,297
Wiki Edits: 38

Thanks: 0
Thanked 1 Time in 1 Post
if it has a (dont quote me)ballast resistor its probably fried. its a ceramic looking thing that drops the voltage so it doesn't burn up the ignition system. should be on the firewall .
yea mysteries are ok when its not your daily driver

sr66
__________________
"SlowRide66"

"Illegitimis non carborundum"
Don't let the bastards grind you down!

Crankshaft Coalition Master List of Hotrodding Forums
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-27-2005, 09:04 PM
Early Iron or No Iron
 
Join Date: Mar 2005
Location: Sundre,Alberta,Canada
Age: 43
Posts: 39
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks guys!

Well,despite showing voltage at the hot feed to the ign switch,the fusible link protecting it failed the "pull test" (ie:it stretched like a rubber band).I swapped it and it's alive!As a note,I also repaired the exposed wire at the bulkhead connector which caused the fuse link to burn out.I mention this for those who read these posts to learn from (like I often do).Never just replace a burnt fusible link (or fuse for that matter) they burn up for a reason!Also another note,these trucks (and vans of the same era) do not use a ballast resistor,that function is contained in the control module Having said that,Rob,you are bang on in mentioning it as a likely culprit,being a veteran of many old Mopars,I ALWAYS carry one in the road toolbox (Ma Mopar offered two varieties,a 4-prong and a 2-prong,the 4 will work in place of a 2,but not vice-versa).Anyway,once again,Thanks guys!
Reply With Quote Quick reply to this message

Recent Electrical posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ignition system info................ poncho62 Electrical 18 10-11-2008 10:10 PM
Elec. fuel pump relay needed? upstand2 Electrical 4 05-10-2005 05:21 AM
p/u coil DJC Transmission - Rearend 4 02-12-2005 09:10 PM
Need info on 1998 Dodge 2500 p/u oldscout Transmission - Rearend 1 06-05-2003 06:26 PM
Dodge P/U 1974 W200 drum to disc hipo225 Suspension - Brakes - Steering 0 04-08-2003 04:26 PM


All times are GMT -6. The time now is 10:16 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.