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bobnoffs
Joined: 04 Jul 2012
Posts: 134
Location: northern wi.
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 Posted: Mon Dec 01, 2025 6:59 am Post subject: resistance in solenoid |
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my voltage number is dropping in my eis. i have determined it is resistance in my continuous solenoid for my battery. this solenoid is from acs and has only 100 hrs on it. i really dont want to redo those fat wires on the firewall to fit a different solenoid but isn't 100 hrs a short lifespan? should a go for a better solenoid?
bob noffs
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user9253
Joined: 28 Mar 2008
Posts: 1945
Location: Riley TWP Michigan
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| Posted: Mon Dec 01, 2025 7:53 am Post subject: Re: resistance in solenoid |
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Bob, does the engine crank and start okay? If so, then maybe the solenoid is
good. Once the engine is running, the aircraft electrical system is powered by
the alternator, not the battery. If the EIS is showing low voltage with the
engine running, suspect the charging system.
The best way to measure low values of resistance is with a voltmeter and
heavy load, not with an ohmmeter.
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Joe Gores |
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jluckey(at)pacbell.net
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| Posted: Mon Dec 01, 2025 10:36 am Post subject: resistance in solenoid |
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Bob,
Assuming you are using the standard and ubiquitous solenoid like the Cole Hersee 24059, it should certainly last more than 100 hrs. More like 10++ years.
JoeG is right on the nose with his advice.
Maybe you could post bus voltage with engine off and voltage with engine running. Also have you confirmed the EFIS numbers with a volt meter?
-Jeff
On Monday, December 1, 2025 at 10:25:38 AM PST, bobnoffs <icubob(at)gmail.com> wrote:
--> AeroElectric-List message posted by: "bobnoffs" <icubob(at)gmail.com (icubob(at)gmail.com)>
my voltage number is dropping in my eis. i have determined it is resistance in my continuous solenoid for my battery. this solenoid is from acs and has only 100 hrs on it. i really dont want to redo those fat wires on the firewall to fit a different solenoid but isn't 100 hrs a short lifespan? should a go for a better solenoid?
bob noffs
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bobnoffs
Joined: 04 Jul 2012
Posts: 134
Location: northern wi.
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| Posted: Mon Dec 01, 2025 3:37 pm Post subject: Re: resistance in solenoid |
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voltage at eis is 12.6 with engine off. it is 14.3 with engine running. i have checked all numbers with eis voltage, handheld voltmeter and panel mounted voltmeter i just bought and they are all aligned.. measured voltage is 13.2 at battery side of solenoid and 12.6 on the load side, engine off. alternator is charging fine and battery voltage is fine but after the solenoid it drops to 12.6. all this is with an earthx, not lead acid.
i haven't actually measured resistance in the solenoid but it seems to be pointing at that, what else could it be?
bob
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alec(at)alecmyers.com
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| Posted: Mon Dec 01, 2025 3:51 pm Post subject: resistance in solenoid |
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| Quote: | measured voltage is 13.2 at battery side of solenoid and 12.6 on the load side, engine off.
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13.2V anywhere with the engine off is extremely suspicious. 12.6 sounds correct for a topped-off lead acid battery, but you’d have to be pulling some major current to drop 0.6V across a solenoid, and if you were pulling any major current from the battery it wouldn’t be anywhere near 12.6V still less 13.2V.
I’d recheck the 13.2V carefully.
On Dec 1, 2025, at 6:38 PM, bobnoffs <icubob(at)gmail.com> wrote:
voltage at eis is 12.6 with engine off. it is 14.3 with engine running. i have checked all numbers with eis voltage, handheld voltmeter and panel mounted voltmeter i just bought and they are all aligned.. measured voltage is 13.2 at battery side of solenoid and 12.6 on the load side, engine off. alternator is charging fine and battery voltage is fine but after the solenoid it drops to 12.6. all this is with an earthx, not lead acid.
i haven't actually measured resistance in the solenoid but it seems to be pointing at that, what else could it be?
bob
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=516709#516709
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alec(at)alecmyers.com
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| Posted: Mon Dec 01, 2025 3:52 pm Post subject: resistance in solenoid |
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Sorry - just realized you’re not using a lead-acid battery, so my voltage comments don’t apply.
On Dec 1, 2025, at 6:50 PM, Alec Myers <alec(at)alecmyers.com> wrote:
| Quote: | measured voltage is 13.2 at battery side of solenoid and 12.6 on the load side, engine off.
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13.2V anywhere with the engine off is extremely suspicious. 12.6 sounds correct for a topped-off lead acid battery, but you’d have to be pulling some major current to drop 0.6V across a solenoid, and if you were pulling any major current from the battery it wouldn’t be anywhere near 12.6V still less 13.2V.
I’d recheck the 13.2V carefully.
On Dec 1, 2025, at 6:38 PM, bobnoffs <icubob(at)gmail.com> wrote:
voltage at eis is 12.6 with engine off. it is 14.3 with engine running. i have checked all numbers with eis voltage, handheld voltmeter and panel mounted voltmeter i just bought and they are all aligned.. measured voltage is 13.2 at battery side of solenoid and 12.6 on the load side, engine off. alternator is charging fine and battery voltage is fine but after the solenoid it drops to 12.6. all this is with an earthx, not lead acid.
i haven't actually measured resistance in the solenoid but it seems to be pointing at that, what else could it be?
bob
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=516709#516709
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