m37 starter help

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guner51
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m37 starter help

Post by guner51 » Wed Jun 12, 2019 5:20 pm

I'm trying to get my m37 running, Its got spark ,new fuel pump and fuel to the carb. but the starter cranks real slow. Is this normal?
would this be the problem?

mdainsd
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Re: m37 starter help

Post by mdainsd » Thu Jun 13, 2019 6:46 am

No. They aren't the fastest cranking systems around but with good batteries and cables they spin over pretty well.

Check all the battery cable connections first. Checking especially for a good ground from the engine to the frame and the batteries to the frame.

If that doesn't help put a volt meter on the batteries and record voltage while cranking. If the voltage is getting pulled down substantially it can indicate starter problems or poor batteries.
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dpcd67
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Re: m37 starter help

Post by dpcd67 » Thu Jun 13, 2019 7:31 am

If you are used to 12 volt starters, a 24 volt one will surprise you by (relatively) how slow they turn.
More like a 6 volt; the difference is that they will crank that way all day. Still, they turn plenty fast to start the truck. (I have owned 4 M37s).
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W. Winget
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Re: m37 starter help

Post by W. Winget » Thu Jun 13, 2019 9:32 am

Speaking of voltage, you ARE running two batteries in Series, not parallel for 24 Volts aren't you?
Ground to (-) on 1st battery, (+) of first battery to second battery (-) terminal, remaining (+) to vehicle Positive cable.

If not, it will be slow for sure. (and maybe not spark well enough to run)
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junking
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Re: m37 starter help

Post by junking » Thu Jun 13, 2019 8:04 pm

I just had simular issue and one of my two 12 v in series batteries was hoing bad. Replaced that bad and right back to normal.

I second the checking the grounds and the bat cable connections.

Good luck!
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