Ballast Resistor
#2908183
04/08/21 09:14 PM
04/08/21 09:14 PM
|
Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
|
OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
|
‘85 truck. 318. Friend’s truck. Will not start after running a little bit. Ballast resistor is real hot. Resistor looks new. Can a door prong resistor be used in order to trouble shoot?
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
|
|
|
Re: Ballast Resistor
[Re: Andrewh]
#2908203
04/08/21 09:46 PM
04/08/21 09:46 PM
|
Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
|
OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
|
It’s getting super hot. Quickly. Plenty of fuel. Spark to and from distributor. New MSD Blaster coil. After truck sits for a little while it starts.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
|
|
|
Re: Ballast Resistor
[Re: dfsmopars]
#2908229
04/08/21 11:29 PM
04/08/21 11:29 PM
|
Joined: Jan 2003
Posts: 4,712 Moved to N.E. Tennessee
GomangoCuda
master
|
master
Joined: Jan 2003
Posts: 4,712
Moved to N.E. Tennessee
|
‘85 truck. 318. Friend’s truck. Will not start after running a little bit. Ballast resistor is real hot. Resistor looks new. Can a door prong resistor be used in order to trouble shoot? You lost me at "door prong resistor ".
Last edited by GomangoCuda; 04/08/21 11:31 PM.
In theory, there is no difference between theory and practice. In practice, there is.
|
|
|
Re: Ballast Resistor
[Re: GomangoCuda]
#2908304
04/09/21 05:18 AM
04/09/21 05:18 AM
|
Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
|
OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
|
‘85 truck. 318. Friend’s truck. Will not start after running a little bit. Ballast resistor is real hot. Resistor looks new. Can a door prong resistor be used in order to trouble shoot? You lost me at "door prong resistor ". Yea I can see that. Four prong.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
|
|
|
Re: Ballast Resistor
[Re: dragon slayer]
#2908429
04/09/21 02:40 PM
04/09/21 02:40 PM
|
Joined: Jan 2003
Posts: 4,712 Moved to N.E. Tennessee
GomangoCuda
master
|
master
Joined: Jan 2003
Posts: 4,712
Moved to N.E. Tennessee
|
What is the resistance on the ballast? So you added new coil and ballast get real hot. That means excessive current and possibly coil over heating. Need to check the wiring, and make sure the resistor meets the coil spec. Exactly . What ignition ecu, what coil and what resistor? They are designed to work together and you may have disrupted the combination with the Blaster coil. Different coils can have very different primary resistance. What works best on a CD ignition is probably very wrong on an Inductive ignition. If the total resistance of the coil and ballast resistor is too low the ECU life may suffer. If the ballast resistance is too low for the coil then coil life could suffer. If the total resistance of the coil and ballast is too high then spark strength will suffer. If everything works together they will have a very long life. Things tend to go sideways If you upset that ballance by changing a part to something inappropriate.
In theory, there is no difference between theory and practice. In practice, there is.
|
|
|
Re: Ballast Resistor
[Re: Andrewh]
#2908439
04/09/21 03:17 PM
04/09/21 03:17 PM
|
Joined: Jan 2003
Posts: 8,393 Highland, MI.
Sunroofcuda
master
|
master
Joined: Jan 2003
Posts: 8,393
Highland, MI.
|
ballast is bypassed during start. so if it was the ballast you would expect it to start then die when you let off the key. Not necessarily true. I had a ballast resistor go bad years ago on a '71 Charger & it would start & run just fine, then just cut-out at very inconsistent intervals. OP, start it & then get out & wiggle the wires connecting to the BR - if it sparks & shuts off, then it's the BR.
No Man With A Good Car Needs To Be Justified
|
|
|
Re: Ballast Resistor
[Re: Sunroofcuda]
#2908441
04/09/21 03:50 PM
04/09/21 03:50 PM
|
Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
|
Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
|
ballast is bypassed during start. so if it was the ballast you would expect it to start then die when you let off the key. Not necessarily true. I had a ballast resistor go bad years ago on a '71 Charger & it would start & run just fine, then just cut-out at very inconsistent intervals. OP, start it & then get out & wiggle the wires connecting to the BR - if it sparks & shuts off, then it's the BR. I had one break!
|
|
|
Re: Ballast Resistor
[Re: NITROUSN]
#2908453
04/09/21 04:27 PM
04/09/21 04:27 PM
|
Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
|
OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
|
It’s getting super hot. Quickly. Plenty of fuel. Spark to and from distributor. New MSD Blaster coil. After truck sits for a little while it starts. Does it have spark when it will not start??? It does have spark when it will not start.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
|
|
|
Re: Ballast Resistor
[Re: dfsmopars]
#2908517
04/09/21 08:52 PM
04/09/21 08:52 PM
|
Joined: Jan 2003
Posts: 18,409 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 18,409
UPPER MICHIGAN, MARQUETTE COUN...
|
It’s getting super hot. Quickly. Plenty of fuel. Spark to and from distributor. New MSD Blaster coil. After truck sits for a little while it starts. Does it have spark when it will not start??? It does have spark when it will not start. So if there is spark to the plugs you are either starved of fuel or flooded.
|
|
|
Re: Ballast Resistor
[Re: Sunroofcuda]
#2908549
04/09/21 10:49 PM
04/09/21 10:49 PM
|
Joined: May 2019
Posts: 6,231 nowhere
Sniper
master
|
master
Joined: May 2019
Posts: 6,231
nowhere
|
ballast is bypassed during start. so if it was the ballast you would expect it to start then die when you let off the key. Not necessarily true. I had a ballast resistor go bad years ago on a '71 Charger & it would start & run just fine, then just cut-out at very inconsistent intervals. OP, start it & then get out & wiggle the wires connecting to the BR - if it sparks & shuts off, then it's the BR. The point was that the ballast is not used during start. So if it won;t start it's probably not the ballast. OP later does say that there is spark when it won't start so the issue probably isn't ignition related, unless the timing is way off. Jumped timing chain?
|
|
|
Re: Ballast Resistor
[Re: Sniper]
#2908565
04/09/21 11:27 PM
04/09/21 11:27 PM
|
Joined: Aug 2007
Posts: 2,356 Kentucky
dfsmopars
OP
top fuel
|
OP
top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
|
I think I got it a little closer tonight. I swapped out the coil with one with higher resistance. About where I would expect it around 1.5-2.0 ohms. Then the timing that was at about 5 degrees BTDC, I moved it to about 3-4 degrees ATDC. Then I noticed the starter motor was dragging just a tad after attempts to start the engine. I put a charger on the battery and it helped some. I at least could sort of repeat the failure and the ignition. It still has its moments where it does not want to start. So the next question I have is this- can the starter become weaker as it warms up? I can pour a cap full of fuel in the carb and it does not help the starting. I don’t think it is flooding because it is a 2V carb that I took off the shelf and it ran well when I put it on there. There is plenty of bad wiring under the hood. Some wiring has lost its insulation. So that stuff has to be cleaned up as well. About the BR, should I be able to hold it in my hand while the truck is running without feeling like I’m going to get burned. I think there are numerous issues working in according. It’s not there but I sa things tonight that encourages me that it will get there. Once it starts it is slick, smooth and responsive.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring ‘14 Big Horn, Quad Cab, 4x4, 1500
|
|
|
Re: Ballast Resistor
[Re: dragon slayer]
#2908640
04/10/21 09:03 AM
04/10/21 09:03 AM
|
Joined: Aug 2005
Posts: 1,383 Az
69hemibeep
pro stock
|
pro stock
Joined: Aug 2005
Posts: 1,383
Az
|
A hot coil will mimic vaporlock. Shut it down after a drive and it won't start, let it cool and away you go again.
Last edited by 69hemibeep; 04/10/21 09:04 AM.
1969 Hemi Roadrunner 2nd owner
|
|
|
|
|