Open or closed circuits Merc 5.7

[Rick D]

Trying to run a 1998 5.7 engine with thunderbolt V ignition on a stand.

There are three sets of electrical connections not hooked up:

The connectors that attach to the stern drive oil reservoir
The connectors for the shift interrupt
Finally some connectors toward the back of the engine that I believe are supposed to go to drive trim senders

Do I need to connect these circuits to themselves to run the engine...or does leaving them not connected replicate a “thumbs up" from their respective switch?

Finally, I've hooked my positive battery directly to the main level g on the starter. I have a momentary switch to activate the starter.

I have a toggle switch hooked up to the battery to power the + on the coil. Do I leave the purple wire on the + side or do I take it off since I'm powering that side with a dedicated wiring off the toggle switch?

 

[jtybt15]

Neg side of coil goes to distributor so you're connecting to the other side to 'HOTWIRE' your ignition system. As long as the (+) side isn't connected to the ignition switch, the interrupt switch shouldn't be in the ignition circuit and if all you want to do is run the engine on a stand, you should be OK with the 'ignition/toggle' switch.

I'm not sure about the 'G' you're talking about. Connect a ammeter set to Ohm/resistance from the 'G' to ground. If it shows 0, or no resistance, it's a ground. DO NOT CONNECT to Batt positive. The starter is grounded by way of it's mounting bolts. To bypass all electrical circuits to test starter, do not connect coil yet. connect heavy jumper cable to heavy connection on starter and momentarily connect to Batt Pos(+). The starter should freely spin but try not to connect the Batt side of cable to a lead post as it will melt it. You can connect a stock battery connector and touch jumper from starter to the head of the steel tightening bolt which will spark but not melt.

Make sure the Pos(+) side of the coil isn't connected to anything but your hotwire from you're Batt or you MAY be activating you're electrical circuit.