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Old 04-22-2014, 01:21 PM   #1
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Accessory Solenoid

A few days ago, I turned the ignition key to the Acc position to energize the HWH and pull the generator slide in. No power. I removed the kick panel on the right front and tapped on the accessory solenoid with a screwdriver handle and it energized the system.

A day later, when I wanted to pull the slides in, the same thing happened. I never had any problem with it before, so my assumption was the solenoid plunger was worn and sticking.

The solenoid was marked 88-24V. I went to Napa and bought a ST88 24 volt solenoid to replace it. I installed it today and no joy. I have to tap on the new solenoid before it will engage.

What am I missing here?
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Old 04-22-2014, 01:25 PM   #2
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I'd check voltage on the 'trigger' wire to the solenoid. Sounds like it's underpowered. Also check ground connection.
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Old 04-22-2014, 01:31 PM   #3
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Quote:
Originally Posted by BFlinn181 View Post
I'd check voltage on the 'trigger' wire to the solenoid. Sounds like it's underpowered. Also check ground connection.
Thanks for the response Bob. The trigger voltage is good - 12.8 Volts. The ground wire has good continuity - 0.2 ohms and no voltage drop to speak of under load (less than 0.01V).
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Old 04-22-2014, 01:39 PM   #4
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If I read you right you are using 12 volts to trigger a 24 volt solenoid?
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Old 04-22-2014, 02:16 PM   #5
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Yes, that's correct. That's what was in there before and anything over 10.5 volts should be sufficient to trigger it.
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Old 04-22-2014, 02:34 PM   #6
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Since a shock (hit) seems to make it work, perhaps check connections on the back of the panel that connect to the solenoid, contact cleaner on the socket connections.
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Old 04-22-2014, 02:50 PM   #7
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After tapping (lightly) on it to get it to engage several times, it seems to work fine now.My theory is that there was some internal friction that has burnished itself away by operating the solenoid.

I've turned the key to Acc position several times and solenoid engages every time now without me touching anything other than the key.
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Old 04-22-2014, 06:59 PM   #8
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The correct replacement for the original solenoid is NAPA ST85.
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