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Author Topic: using cool new multimeter to check all engine components  (Read 286 times)

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crieders

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using cool new multimeter to check all engine components
« on: December 23, 2021, 12:22:48 PM »

any good article around about how to use a multimeter to check solenoids for starting motor, glo plugs, ground, starting motor itself? . Engine turns over with no umph; not enough energy to start the engine. Batteries do check out ok, even as to available cranking power.
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Cliff Rieders, c34 tall rig, 1990, hull #1022

KWKloeber

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Re: using cool new multimeter to check all engine components
« Reply #1 on: December 23, 2021, 01:23:19 PM »

Cliff

Whatís your basis that the batts have plenty of cranking power?

The glow plugs have zero to do with cranking.

Iíd say first you need to understand what each part of the two starting circuits do, then you can check whether thereís appropriate voltage at each key point/connection.
Or, if you search thereís about a thousand message posts about what the critical things to check are, the vast majority donít need a meter (just inspection/cleaning/de-corroding/tightening.)  The one that really benefits from a V check is the key switch/S-wire circuit, and of course the V delivered to the solenoid B terminal while cranking.
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
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Ron Hill

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Re: using cool new multimeter to check all engine components
« Reply #2 on: December 23, 2021, 02:15:35 PM »

Cliff : Take a look at all of your battery connections (clean? tight?), especially the #4 size negative wire that attaches to the engine bell housing!!

A few thoughts
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mark_53

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Re: using cool new multimeter to check all engine components
« Reply #3 on: December 23, 2021, 10:41:35 PM »

Do you have the OEM wiring?
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1989 C34 Mk1 M25XP Danforth 25lb, adjustable backstay, fin keel, EV100 autopilot, E7D Chartplotter, Navpod, Mack Pack, CDH diesel heater, Grp 75 start and 2 Grp 27 House batteries, Blue Sea ACR.

crieders

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Re: using cool new multimeter to check all engine components
« Reply #4 on: December 24, 2021, 10:33:59 AM »

not sure. When I bought the boat, 30 yrs ago, I had a new wiring harness put in since there was a fire issue about the original.
its time to test the solenoids, the starting motor, the glo plugs, the ground, all the connections, the 3 batteries  . the battery connections look good and tight.
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Cliff Rieders, c34 tall rig, 1990, hull #1022

KWKloeber

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Re: using cool new multimeter to check all engine components
« Reply #5 on: December 24, 2021, 11:16:22 AM »

Cliff

You asked about slow turning over not long ago and there were significant discussions and suggestions about tracking that down??

https://c34.org/bbs/index.php/topic,11183.msg88980.html#msg88980
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
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Ron Hill

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Re: using cool new multimeter to check all engine components
« Reply #6 on: December 24, 2021, 01:57:59 PM »

Cliff : I'm sure that you probably have the OEM wiring!.   IF YOU CHANGED WIRING - you would know it - so you should still have the basic OEM wiring.

All battery connections you say are clean and tight, but Did you check? that #4 ground going to the bell housing??  I ask because it is hard to get to and people forget about it!!

A thought
« Last Edit: December 25, 2021, 11:09:45 AM by Ron Hill »
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mark_53

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Re: using cool new multimeter to check all engine components
« Reply #7 on: December 25, 2021, 10:00:22 AM »

not sure. When I bought the boat, 30 yrs ago, I had a new wiring harness put in since there was a fire issue about the original.
its time to test the solenoids, the starting motor, the glo plugs, the ground, all the connections, the 3 batteries  . the battery connections look good and tight.
Put in a dedicated start battery and rewire so the main bank is charged directly by the alternator. The original wire harness is just not robust.  To many connections, under wire size, and length.
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1989 C34 Mk1 M25XP Danforth 25lb, adjustable backstay, fin keel, EV100 autopilot, E7D Chartplotter, Navpod, Mack Pack, CDH diesel heater, Grp 75 start and 2 Grp 27 House batteries, Blue Sea ACR.
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