SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: SomeThingWilder on August 05, 2015, 10:56:57 PM
-
Who runs ones and why? I cheated and order the bbc engine wiring harness from hardin. The engine harness is wired up for a relay ( seloniod ) . I've talk to a few of my elders and they said it is not needed on a bbc maybe a ford but not a chevy. Any insight fro. The professionals is much appreciated in advance
-
I run a solenoid on the back of the pass. side head, so the starter is not 'hot' except when starting. And its easier to switch starters, too. (454, BBC)
All my GM trucks have them too, for heat soak..
Dan'l
-
What you are talking (I assume) is a slave solenoid. Using a Ford style puck relay. Correct?
The reasons are actuality two fold.
First and foremost, it provides battery voltage to the starter mounted solenoid on the GM starter, if you think about it, the power for the dash cones from the battery, which in 90% os the time is at the transom of the boat. So let's say, battery, to terminal, to terminal block, to dash at ignition switch, now downgrade the wire a few sizes and go from the starter, to the terminal block, to the starter that has to pull the Bendix into type flywheel and pull in the contacts to spin the starter motor.
That's over 30' of wire and about 6 terminals. The voltage drop is crazy.
When you run the slave solenoid, all that wire has to do is pull in the easier solenoid, very low current draw. This puts virtually full battery voltage to the GM solenoid, as a plus, if you use the "I" terminal on that solenoid to bump the coil voltage, everything gets a little boost.
I have tested it and have seen voltage drops to the starter to be as much as 6 volts. Meaning your trying to pull in the starter Bendix on half the rated voltage. This is twice the normal current.
This solenoid install will really reduce starter failures.
GT
-
X2 on what mash on it says.... not really needed for gm but a nice addition..iv always ran them on cars when i put the battery in the trunk.. just remember u have to run a jumper wire from the main power on ur starter to the signal terminal at the starter for it to work..O0
Sent from my MB860 using SoCal Jet Boats mobile app
-
X2 for gt as well... O0
Sent from my MB860 using SoCal Jet Boats mobile app
-
Thanks GT you confirmed what I thought about the voltage drop.
-
What you are talking (I assume) is a slave solenoid. Using a Ford style puck relay. Correct?
The reasons are actuality two fold.
First and foremost, it provides battery voltage to the starter mounted solenoid on the GM starter, if you think about it, the power for the dash cones from the battery, which in 90% os the time is at the transom of the boat. So let's say, battery, to terminal, to terminal block, to dash at ignition switch, now downgrade the wire a few sizes and go from the starter, to the terminal block, to the starter that has to pull the Bendix into type flywheel and pull in the contacts to spin the starter motor.
That's over 30' of wire and about 6 terminals. The voltage drop is crazy.
When you run the slave solenoid, all that wire has to do is pull in the easier solenoid, very low current draw. This puts virtually full battery voltage to the GM solenoid, as a plus, if you use the "I" terminal on that solenoid to bump the coil voltage, everything gets a little boost.
I have tested it and have seen voltage drops to the starter to be as much as 6 volts. Meaning your trying to pull in the starter Bendix on half the rated voltage. This is twice the normal current.
This solenoid install will really reduce starter failures.
GT
So one like this shoukd work
-
So one like this shoukd work
yes that's what I run
-
Ill wait to say yes till the master chimes in..but ya thats what they look like!! Lol
Sent from my MB860 using SoCal Jet Boats mobile app
-
So one like this shoukd work
Those work ok. A little funky to mount.
Here's what I use, not saying right or wrong, I just like the look.
http://www.iboats.com/OMC-Sterndrive-Cobra-Solenoids/dm/view_id.269439
GT
-
Thanks guys appreciate it
-
I run a solenoid on the back of the pass. side head, so the starter is not 'hot' except when starting. And its easier to switch starters, too. (454, BBC)
All my GM trucks have them too, for heat soak..
Dan'l
The only thing I switch with the slave is the "s" terminal on the start mounted solenoid. The battery cable still goes directly to the starter motor.
I run a 10 gauge wire through the contacts of the slave from battery right to the "S". The starter is then activated with the slave from the dash.
GT
-
So with the remote solenoid you are eliminating the fact that the starter mounted solenoid no longer uses power from the dash to push the bendix. It now uses power direct from the battery thriugh the remote solenoid to push the bendix. Is this correct? Because now it makes sense. The remote solenoid does less work. The starter mounted solenoid works easier due to less resistance of all that wiring. Nearly direct from battery. I'm sold. (sorry, just thinking out loud).
-
The fog.....it's lifted.... :thumbup:
-
So with the remote solenoid you are eliminating the fact that the starter mounted solenoid no longer uses power from the dash to push the bendix. It now uses power direct from the battery thriugh the remote solenoid to push the bendix. Is this correct? Because now it makes sense. The remote solenoid does less work. The starter mounted solenoid works easier due to less resistance of all that wiring. Nearly direct from battery. I'm sold. (sorry, just thinking out loud).
Uh huh.
Well when you say it that way, it makes perfect sense. Lol
GT
-
Here's a picture of my solenoid mounting locations
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fimages.tapatalk-cdn.com%2F15%2F08%2F06%2F0aa5547e2c9d3eb894dcd2f74a4fcf3c.jpg&hash=c40b215280fc0f4977b0ffa1eda55c5683ea1023)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fimages.tapatalk-cdn.com%2F15%2F08%2F06%2Fb91311f7ba2766173f0ed4591016e09e.jpg&hash=8132ec018be083314e045a55873dd5a808821e4b)