yelow purple wire at starter should it be hooked up

[pjnadon]

I recently installed a reman long block 4.3 mercruiser in my 97 starcraft other owner didn't winterize it and the block cracked. question I have is the purple yellow wire that powers the fuel pump at the starter when I swapped everything over that wire was taped up. when I hook the wire with the yellow red wire on the starter the boat wont run it starts runs for 30 seconds and shuts down unhook the wire motor runs and starts perfect I thought that the wire was to run the fuel pump until the motor started and had oil pressure or has there been something bypassed

 

[Bt Doctur]

the yellow/red wire hooks to the small lug closest to the block, the yellow/purple wire hooks to the small lug away from the block

 

[pjnadon]

the thing is that there is no second small lug there is one big one for the red wires one that ties into the starter and the small one for the yellow and red is it possible the solenoid has been changed out with the wrong one

 

[Fun Times]

Some starters the solenoid can be switched out more easily while with other started designs it may be easier to just replace the whole starter. If the stud seems to be missing then there's a good chance one of the two had been switched out somewhere along the line.

The wire connected to the starter helps to ensure the fuel pump will have immediate full 12 volt power going to it while cranking the engine over, once you build 4+ psi of oil pressure, the oil switch should control the power to the pump. Go under 4 psi and the switch turns the fuel pump off.

4 psi is easy to reach during normal cranking speed so you are eventually (pretty quickly) getting power to the pump. But in theory it's just taking a little bit longer to turn the pump on which could make the engine take a little longer to start up is all.

Here's a good diagram for you to look at,
http://forums.iboats.com/forum/boat-...01#post2667001

Hopefully it's a ignition protected marine rated starter, if not, it's in your best interest to get a marine starter for your safety.

Ignition Protected Marine Parts: Marine SAE J1171, laid-out by the Society of Automotive Engineers (SAE).

Ignition Protection is an important safety aspect for marine electrical components. Improperly vented engine compartments and bilges increase the explosive potential of ignition due to errant sparks. Dangerous fumes may be emitted from leaking gasoline, propane, CNG lines or tanks. Blowers on larger vessels cycle fresh air below decks to remove dangerous fumes. To help prevent sparks, marine starters, alternators, distributors, starter solenoids, and electrical motors are designed with Ignition Protection. To earn this designation, tests are conducted to ensure a design can suppress sparks that are known catalysts for shipboard explosions. Lesser priced automotive counterparts do not require this same safeguard. Testing agencies such as UL Marine or IMCI (International Marine Certification Institute) certify marine engine parts, but only after rigorous testing. Some manufacturers such as Arco and Marine Electrical Systems test starters on-site for compliance with CE standards. Marine grade quality is based not only on ignition protection but high tolerance to temperature extremes, voltage surges, impact, vibration, chemicals and salt spray. Any engine repairs should use certified marine parts for the safety of all passengers. Proper electrical installation is easier than doing the job twice. To avoid future problems, try to run continuous wire in moist areas of engine compartments, but if you must use connectors, be sure to use quality mechanical connectors insulated against moisture intrusion. Avoid using wire nuts! If you are unsure of best marine electrical installation practices, seek the help of qualified marine technicians.

 

[Bondo]

the thing is that there is no second small lug there

Ayuh,.... Welcome Aboard,.... Sounds like an automotive starter, not a Marine rated starter,.....