oh my crazy dodge
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Joined: May 2010
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oh my crazy dodge
I have a 94 1500 dodge, It will start fine when cool, but after reaching running temp if I shut it off it will not restart. I have replaced the battery, starter and the alternator. Could this be the computer??
And actually today (a warm day) it would not start even after sitting all day had to arch the starter. I does not spit, spudder or stall... any answers anyone?
And actually today (a warm day) it would not start even after sitting all day had to arch the starter. I does not spit, spudder or stall... any answers anyone?
Administrator
Joined: Apr 2010
Posts: 87,399
Likes: 4,214
From: Clayton MI
Bad connection somewhere, or, failing starter motor.
To test, when the starter FAILS to operate, check for voltage at the brown wire AT the starter, should be 12 volts when the key is in the start position. If there is, and the starter still doesn't wanna work, replace the starter.
If not, check for power at pin 86 of the starter relay. (key also in start position) have to remove the relay for this, pins are labeled on the bottom side of the relay, if not on the PDC itself.
if you have power there, and putting everything back in, and the starter still fails to turn, replace the relay.
If not power there, ignition switch is prolly bad.
To test, when the starter FAILS to operate, check for voltage at the brown wire AT the starter, should be 12 volts when the key is in the start position. If there is, and the starter still doesn't wanna work, replace the starter.
If not, check for power at pin 86 of the starter relay. (key also in start position) have to remove the relay for this, pins are labeled on the bottom side of the relay, if not on the PDC itself.
if you have power there, and putting everything back in, and the starter still fails to turn, replace the relay.
If not power there, ignition switch is prolly bad.
Grand Champion
Joined: Apr 2010
Posts: 5,011
Likes: 6
From: Meeker, CO
I'd guess that it's the relay in the power distribution panel. The cute little electromagnet that pulls the relay has a ferrite core inside that moves when the current is applied to the relay coil, and over time the cores become magnetized so they don't pull as hard. Hot cores also don't pull as hard. So add the magnetization and heat together and what you've got is a relay that works best or only when cold. (Yes, by golly, I am an electrical engineer! 
)
You can check this when it's hot and won't start by swapping the blower motor relay for the starter relay. If it will then start, and especially if the blower motor won't run, you've nailed it without ever touching a voltmeter.
)You can check this when it's hot and won't start by swapping the blower motor relay for the starter relay. If it will then start, and especially if the blower motor won't run, you've nailed it without ever touching a voltmeter.
