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post #1 of 17 (permalink) Old 04-22-2012, 09:28 PM Thread Starter
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93 Ram Diesel relays?

I have a 93 RAM350 with the 5.9 cummins and there are three relays on the inner fender on the drivers side. Can anybody tell me what they are for? I do know the one towards the back of the fender is the starter relay. I am having problems with the cold start and when it doesnt work the front relay is clicking? Any help would be great, Thanks


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post #2 of 17 (permalink) Old 04-22-2012, 09:49 PM
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The one closest to firewall is the A/C, Starter, and ASD relay. By cold start are you meaning the grid heater, if so the grid heater is controlled by the 2 solenoids sitting on top of the left fender well.

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post #3 of 17 (permalink) Old 04-22-2012, 10:36 PM Thread Starter
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So if I read your message right the first and second relay are for the grid heater? Where can I find new ones? Thanks

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post #4 of 17 (permalink) Old 04-22-2012, 10:40 PM
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The top picture shows 3 relays in a row mounted on the side of the fender, none of those are for the grid heater.

The left corner of the picture are the solenoids for the grid heater, 2 of them each one has 2 big black wires on the top.

92 D250 parted out

97 2500 4X4 auto, 8 fuel plate, BD converter

96 F250 4x4 with 92 Cummins zf5
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post #5 of 17 (permalink) Old 04-22-2012, 10:47 PM Thread Starter
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The three relay on the fender. What are the first two for?

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post #6 of 17 (permalink) Old 04-22-2012, 10:52 PM
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The one closest to the firewall is the air conditioner, the one in the middle is for the starter.

92 D250 parted out

97 2500 4X4 auto, 8 fuel plate, BD converter

96 F250 4x4 with 92 Cummins zf5
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post #7 of 17 (permalink) Old 04-22-2012, 11:00 PM Thread Starter
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What is the one in the front for? Closer to the battery?

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post #8 of 17 (permalink) Old 04-22-2012, 11:07 PM
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ASD Automatic Shut Down it's for the charging system tells the ECM that the engine isn't turning.

92 D250 parted out

97 2500 4X4 auto, 8 fuel plate, BD converter

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post #9 of 17 (permalink) Old 04-23-2012, 08:17 AM Thread Starter
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So if that relay is bad? Sound like I have two different problems. The heater grid has not worked in some time so I disconnected it from the battery. I thought that front relay was part of the heater grid so that why I disconnected it. The truck only gets used in the summer but I would still like to fix it. When you turn the key on the wait to start light doent come on but as soon as you start the truck the light flickers and the alternator wont charge. If you put you hand on the front relay you can feel it clicking really fast. If I unplug this relay a few times it will usually put the light out and start charging?

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post #10 of 17 (permalink) Old 04-23-2012, 08:55 AM
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The front relay ( ASD ) you could swap with the middle one and if the truck won't start then the relay is bad. Your alternator is regulated by the ECM unless you have a external regulator on. The CPS on the front of the engine is what tells the ECM the engine is turning, it should have a .050 air gap.

The alternator needs to be grounded good, along with the frame and body.

The grid heater is controlled by the ECM, there is a intake air temp sensor in the intake manifold. It tells the ECM that the engine temp is below 60 and the wait to start will come on which means the grid heater is cycling. You can operate the grid heaters off a push button and use them when you need them, shouldn't until temp is 40 and below.

92 D250 parted out

97 2500 4X4 auto, 8 fuel plate, BD converter

96 F250 4x4 with 92 Cummins zf5
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post #11 of 17 (permalink) Old 04-23-2012, 10:19 PM Thread Starter
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Thank you for all your help. I disconnected the heater grid a couple of years ago because I thought it was staying on because the alternator would not charge and I assumed it was drawing because the heater grid was on. I was wrong it just wasnt charging. So what I am going to do it hook everything back up and start from square one. I dont think there is anything wrong with the heater I am pretty sure that the alternator relay is bad.

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post #12 of 17 (permalink) Old 04-24-2012, 03:40 AM
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You do know that the regulator for the alternator is in the ECM unless someone has replaced it with a external regulator?

If you need a wiring schematic there's one in the 1st gen tech section.

92 D250 parted out

97 2500 4X4 auto, 8 fuel plate, BD converter

96 F250 4x4 with 92 Cummins zf5
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