ignition issue? ballast resistor hot.
#700517
05/17/10 03:05 PM
05/17/10 03:05 PM
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Joined: Jan 2003
Posts: 192 Minnesota
Shaggy
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1978 dodge truck 4 pin ballast. Been parked 4-5 years, but was my daily driver before this. Got it running again, but it seems to be cooking the ballast resistor. It will restart fine again if left to cool off. Amp gauge is reading high so I think it might be overcharging??? Will a bad voltage regulator cause this?
1969 Dart
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Re: ignition issue? ballast resistor hot.
[Re: Shaggy]
#700518
05/17/10 03:06 PM
05/17/10 03:06 PM
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Joined: Dec 2007
Posts: 7,759 So Cal
HealthServices
Why would you even post that?
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Why would you even post that?
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So Cal
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Don't understand the question is the truck not starting or are you worried the resister is getting hot?
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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Re: ignition issue? ballast resistor hot.
[Re: Shaggy]
#700519
05/17/10 03:10 PM
05/17/10 03:10 PM
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Joined: Jan 2003
Posts: 5,445 So Cal
Sinitro
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If the charging system has a problem of high output voltage, then the ballast resistor will run very hot.. Eventually it will burn itself up because its resistance increases as it heats up forcing it to absorb more voltage... Just my $0.01.. ![](/ubbthreads/images/graemlins/wink.gif)
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Re: ignition issue? ballast resistor hot.
[Re: Sinitro]
#700520
05/17/10 03:21 PM
05/17/10 03:21 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Might slow charge the battery on a charger overnight
live every 24 hour block of time like it's your last day on earth
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Re: ignition issue? ballast resistor hot.
[Re: RapidRobert]
#700521
05/17/10 03:24 PM
05/17/10 03:24 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
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Upper Midwest
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Ballast resisters run hot. You don't want to touch one at an time. New they will smoke. ![](/ubbthreads/images/graemlins/thumbs.gif) Ballast resister should have nothing to do with the rate of charge.
Clean it, if it's Dirty. Oil it, if it Squeaks.
But: Don't fix it, if it Works!
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Re: ignition issue? ballast resistor hot.
[Re: MoparforLife]
#700522
05/17/10 03:37 PM
05/17/10 03:37 PM
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Joined: Jan 2003
Posts: 192 Minnesota
Shaggy
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It will start and run when it's cold/first started. But if run for awhile then shut off it won't restart and it acts like a bad ballast as it fires once after cranking over and then the key is released due to no start. Starts fine again after cooling off for a bit. It's charging at 14.78 volts. Can the voltage regulator be tested?
Last edited by Shaggy; 05/17/10 03:42 PM.
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Re: ignition issue? ballast resistor hot.
[Re: RapidRobert]
#700523
05/17/10 03:38 PM
05/17/10 03:38 PM
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Joined: Jan 2003
Posts: 192 Minnesota
Shaggy
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Quote:
Might slow charge the battery on a charger overnight
Did that. ![](/ubbthreads/images/graemlins/thumbs.gif)
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Re: ignition issue? ballast resistor hot.
[Re: Shaggy]
#700524
05/17/10 03:43 PM
05/17/10 03:43 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
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If it were the ballast it would not be intermittant like that. Once burnt out they are dead. Are you sure that yo aren't boiling fuel out from the carb into the intake causing a flooding condition. Have you tried to start it holding the gas pedal to the floor to unload a flooded engine. ![](/ubbthreads/images/graemlins/shruggy.gif) Coils can also have thermal breakdowns.
Clean it, if it's Dirty. Oil it, if it Squeaks.
But: Don't fix it, if it Works!
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Re: ignition issue? ballast resistor hot.
[Re: MoparforLife]
#700525
05/17/10 03:53 PM
05/17/10 03:53 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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When it's good & hot & acting up I'd have a helper turn the key to "start" with you under the hood checking voltages at the coil/ballast and do you have another good dist you could plug in at that point in time and spin it by hand to see if it's the pickup. yes charging the batt suggestion was not for the ballast but was for the bulkhead as to not aggravate things any further till you sort it out
live every 24 hour block of time like it's your last day on earth
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Re: ignition issue? ballast resistor hot.
[Re: RapidRobert]
#700528
05/17/10 04:02 PM
05/17/10 04:02 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
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Upper Midwest
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Quote:
Quote:
pulled the coil wire and just get the one spark when it won't start and the key is turned off.
Sounds like classic ballast issue sort of but the last time my old truck acted like that it was the ECU
I agree Robert but cooling off wouldn't bring the ballast back to life. It could a coil, ECU, or pick up coil with thermal breakdown. But when the connection in a ballast is burnt off it is gone.
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Re: ignition issue? ballast resistor hot.
[Re: Shaggy]
#700529
05/17/10 04:21 PM
05/17/10 04:21 PM
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Joined: Feb 2003
Posts: 10,218 Someplace you aren't
SomeCarGuy
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Sounds like a bad ECU, or more likely a bad ground to the ECU. Rusted from sitting I bet.
I want my fair share
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Re: ignition issue? ballast resistor hot.
[Re: SomeCarGuy]
#700534
05/17/10 10:16 PM
05/17/10 10:16 PM
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Joined: Dec 2003
Posts: 5,314 Carstairs, Alberta, Canada
dave571
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Carstairs, Alberta, Canada
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Quote:
Sounds like it was a bad ground.
Bad ground or other connection problem IF it stays gone now.
If not, it's just an intermittant component you haven't found yet.
Your previous(prior to the reg change) voltage readings were fine. You asked abouth testing the regulator. By reading the voltage with it running, that is what you did. Changeing the regulator, to the one you have now, with the slightly lower reading, should not have affected anything. Not any good components anyway.
If it stays gone, it was a resisitance in a connection somewhere getting hot. If it comes back, ikt's a resistance in a component (pickup coil, ecu) doing the same thing.
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Re: ignition issue? ballast resistor hot.
[Re: dave571]
#700535
05/18/10 07:16 PM
05/18/10 07:16 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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I could very well be the ballast, it's called an intermittent OPEN. If there is an open in the resstance wire the ballast is made out of it will get larger as it heats up. It is entirely possible that, cold, the break touches fine, but as it heats up and thnigs expand the connection is lost and the enigine dies. Once it cools off it works, classic intermittent open behavior.
Easy test, jumper out the ballast and see if it runs then, pull the jumper and see if it dies again.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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