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jdemaris
01-13-2004 05:26:05
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Re: Re: Re: 350B Start problems. in reply to SteveB, 01-13-2004 04:51:12
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Yes, the pump shut-off solenoid does not care where it gets its 12 volt power from. Older 350s didn't even use one. The 350 wiring system is pretty simple (famous last words?). Bad or disconnected neutral-safety switch will affect cranking, but not running. If the wiring is original, main battery power for the machine comes from the big post on the Delco starter solenoid (8 or 10 gauge wire). I'm going by memory, so I might miss few items, though . . . That main power lead, as well a other wires, go to the main wire harness connector under the hood - right at the hood seam by the cowl. That connector is where we had most of our electrical problems. On many of them, we just cut wires and bypassed the connector. From there power goes to the BAT terminal of the ignition switch (on some machines there might be a 30 amp circuit breaker in between). When the key is turned on, the IGN terminal is energized, and power flows to the start button. Somewhere at this point - either just before or after the switch, power runs through the neutral safety switch on the gear-transmission (not reverser). It then finds runs back through the main harness connector and down to the S terminal on the Delco solenoid. The power to the S terminal on the Delco solenoid has a long length to travel. Although it's a fairly low amperage draw for a diesel starter, the 10-15 amps or so is enough to cause trouble when dirty connections show up, the ignition switch goes bad, etc. Testing at certain points with a voltmeter won't do you much good unless you're testing it while under a load - i.e. in this case with the ignition switch turned on and holding the start button in - you then look for a voltage drop. Although not necessary, you can make the system more reliable by installing a small starter relay (cost about $8). Then let the wire that now goes to the Delco S terminal go to this relay instead - thus letting the relay carry the 10-15 amp load instead of the ignition switch, start button, and neutral safety switch. Relay will draw about 2 amps. It's simple to do; it's standard on large diesel powered units.
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