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Old 11-19-2020, 01:49 AM   #1
Juster
 
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Default Main Relay Clicking Rapidly No Start

Hello guys

So recently my truck has developed a no start issue. Was running fine a few days ago but now it doesn't even wanna start. So when I put the key to the on position the main relay keeps clicking rapidly. This also makes the fuel pump keep going on for a sec then off then on again. Doesn't stop unless I turn the key off.

Any suggestions on what to check? I already checked the fuel pump by jumping the relay and it's working fine.

The truck is a 1989 Nissan Hardbody 5 speed with the Z24i engine.
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Old 11-19-2020, 02:00 AM   #2
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Check your battery and its connections. Are they tight? Got a meter to check voltage? Let us know what you find.
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Old 11-19-2020, 02:28 AM   #3
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The battery is good (Took it out from my good truck so I know it's not the issue). The battery connectors are tight and has no corrosion build up either. Checked it already with a voltmeter, Main Relay getting 12 volts but it keeps bouncing around from 11 to 12 volts rapidly same thing with the fuel relay.
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Old 11-19-2020, 04:02 AM   #4
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Replace the ground strap, and add a second directly from the negative battery terminal to somewhere on the block or head. Check/clean/tighten the other ends of your battery cables too. Be safe!
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Old 11-19-2020, 03:44 PM   #5
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fusiable links good? is it the big blue relay that is clicking??
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Old 11-19-2020, 05:54 PM   #6
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Quote:
Originally Posted by Juster View Post
The battery is good (Took it out from my good truck so I know it's not the issue). The battery connectors are tight and has no corrosion build up either. Checked it already with a voltmeter, Main Relay getting 12 volts but it keeps bouncing around from 11 to 12 volts rapidly same thing with the fuel relay.
Try connecting jumper cables from another vehicle to see if the rapid clicking goes away.

It sounds like the voltage might be a bit low on your battery. If the weather has recently gotten cooler, it won't have as many cold cranking amps for starting the engine.
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Old 11-19-2020, 08:33 PM   #7
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With no luck, I cleaned most of the grounds in the engine bay. Cleaned the ground from the battery to the inner well fender to the block of the engine. Still getting the same issue from the relays.

Did try jumping it with another vehicle same thing relay will just keep clicking rapidly.

And it's the green relays clicking.

I can rule out that the battery isn't the issue.

EDIT: Further inspection figured both coils aren't getting spark now. That figures something to do in that area maybe.

Last edited by Juster; 11-19-2020 at 08:59 PM.
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Old 11-19-2020, 09:12 PM   #8
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Green relays? I don't know the Z24 well or any canadian variants. Any more info you can give me on the relays? What they do, where they go, etc?
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Old 11-19-2020, 09:21 PM   #9
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Quote:
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Green relays? I don't know the Z24 well or any canadian variants. Any more info you can give me on the relays? What they do, where they go, etc?
Yes green, for the fuel pump relay and the main relay. Both located near the battery on the passenger side inner fender well.

Currently checking the ignition coil harness if I can find a ground.
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Old 11-19-2020, 09:43 PM   #10
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Take that relay to the auto parts store and get a new one.
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