Re: Starter relay causing ignition problem
[Re: chargers777]
#3197880
12/16/23 09:02 AM
12/16/23 09:02 AM
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Joined: Dec 2014
Posts: 5,886 ohio
ruderunner
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master
Joined: Dec 2014
Posts: 5,886
ohio
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Off the top of my head, the ignition wire at the relay is jut to bypass the ballast resistor when cranking. Unless it shorts out somewhere I don't see it causing a stall situation.
Assuming the problem persists after changing the ECU and coil, I'd be suspect of the pickup coil in the distributor.
Of course 50 year old wires are always suspect.
Angry white pureblood male
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Re: Starter relay causing ignition problem
[Re: ruderunner]
#3198012
12/16/23 04:46 PM
12/16/23 04:46 PM
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Joined: Jan 2003
Posts: 15,424 Omaha Ne
TJP
I Live Here
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I Live Here
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Posts: 15,424
Omaha Ne
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Off the top of my head, the ignition wire at the relay is jut to bypass the ballast resistor when cranking. Unless it shorts out somewhere I don't see it causing a stall situation.
Assuming the problem persists after changing the ECU and coil, I'd be suspect of the pickup coil in the distributor.
Of course 50 year old wires are always suspect. Agreed, and the ballast is bypassed in the start position so that eliminates it. I would check the see if you're are getting spark when the problem occurs. If not, verify grounds even if you've already done so. I have in th epast run a small braided ground strap between the ECU and engine block making sure both surfaces are clean of paint etc. Using a brass or non magnetic feeler gauge, check the reluctor gap to pick up coil, should be .008-.010" . usually a good idea to check it in a couple of places. Then try the pickup coil. Keep us posted
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Re: Starter relay causing ignition problem
[Re: chargers777]
#3198061
12/16/23 09:38 PM
12/16/23 09:38 PM
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Joined: May 2019
Posts: 6,289 nowhere
Sniper
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master
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Posts: 6,289
nowhere
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Can this happen? I have a 74 d100 and it randomly stops running and won't start for awhile. I changed coil and ECU with known good ones but was wondering about the starter relay since it has a spot for ignition. Some troubleshooting rather than ransom parts swapping might help. Are you even getting voltage to the coil when this happens?
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Re: Starter relay causing ignition problem
[Re: chargers777]
#3198086
12/17/23 08:25 AM
12/17/23 08:25 AM
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Joined: Jan 2003
Posts: 21,076 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,076
Niles , Ohio
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Every early one Ive had had a problem with the amp meter.Seems they burn and would let the vehivle die.Then they would restart.I pulled every one and used a small screw and nut then taped the 2 wires together eliminating the amp meter.Then install a volt meter
Chrysler Firepower
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Re: Starter relay causing ignition problem
[Re: ruderunner]
#3198304
12/18/23 03:32 AM
12/18/23 03:32 AM
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Joined: Aug 2007
Posts: 6,096 Valencia, España
NachoRT74
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Posts: 6,096
Valencia, España
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Off the top of my head, the ignition wire at the relay is jut to bypass the ballast resistor when cranking. Unless it shorts out somewhere I don't see it causing a stall situation. I asked because a guy on YouTube said ignition relay was shorting out internally and caused his truck to die. Getting voltage to the coil. Of course I checked that. Problem is intermittent making typical voltage checks difficult. That’s just in lates 70 setup, where the ballast bypass comes from starter relay instead the ign switch like previous years. But by 74 the ballast bypass still comes straight from ign switch. So by 74 there is no any kind of connection between starter relay and ign system where a short could make anything on ign system
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Starter relay causing ignition problem
[Re: chargers777]
#3198349
12/18/23 10:49 AM
12/18/23 10:49 AM
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Joined: Jan 2003
Posts: 2,926 A shed in England
Tig
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master
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A shed in England
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Not saying this is the issue but we chased a random / topend misfire on my wifes '68 Barracuda for a while, it would also cut out going round corners from time to time. Turned out to be the key ign switch.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Starter relay causing ignition problem
[Re: chargers777]
#3198359
12/18/23 11:30 AM
12/18/23 11:30 AM
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Joined: Jan 2003
Posts: 4,733 Moved to N.E. Tennessee
GomangoCuda
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Moved to N.E. Tennessee
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Can this happen? I have a 74 d100 and it randomly stops running and won't start for awhile. I changed coil and ECU with known good ones but was wondering about the starter relay since it has a spot for ignition. When this happened to me it was the bulkhead connector. Pull it off and look for corroded, melted or burnt terminals. As Cab said a volt meter or even a 12v test light can be used to track down problems like this BEFORE you start swapping or buying parts.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: Starter relay causing ignition problem
[Re: ruderunner]
#3198509
12/19/23 01:20 AM
12/19/23 01:20 AM
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Joined: May 2006
Posts: 1,757 Phila
PhillyRag
top fuel
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top fuel
Joined: May 2006
Posts: 1,757
Phila
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Off the top of my head, the ignition wire at the relay is jut to bypass the ballast resistor when cranking. Unless it shorts out somewhere I don't see it causing a stall situation.
Assuming the problem persists after changing the ECU and coil, I'd be suspect of the pickup coil in the distributor.
Of course 50 year old wires are always suspect. Some times after the pickup coil gets hot, being inside distributor, it will lose conductivity. After cools somewhat, reestablishes conduct. Bad wires, or an internal connection, possible. Put ohmmeter on plug & wiggle around to see. Or just replaces with new.
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Re: Starter relay causing ignition problem
[Re: Cab_Burge]
#3198696
12/19/23 06:33 PM
12/19/23 06:33 PM
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Joined: Dec 2014
Posts: 5,886 ohio
ruderunner
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master
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Posts: 5,886
ohio
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That's neutral safety switch.
For many years Dodge trucks did take the resistor bypass from the starter relay. Possibly not in a 74 though per one poster here.I don't have a diagram for that year.
Angry white pureblood male
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Re: Starter relay causing ignition problem
[Re: ruderunner]
#3198897
12/20/23 03:23 PM
12/20/23 03:23 PM
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Joined: Aug 2003
Posts: 43,228 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,228
Bend,OR USA
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The neutral safety switch, depending the car year and model will be either in the tranny or on the steering collum, the starter relay that activates the starter solenoid from the ignition switch is usually mounted on the firewall
Last edited by Cab_Burge; 12/20/23 03:24 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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