1. The solenoids are Continous Hold solenoids. They're made to be working ALL the time...
2. Change the oil pressure switch.
3. Isolating Solenoid is Part Number ST95, 80 Amp, continuous duty, 3-terminal, 16-20 ohm coil.
4. I'm not a fan of this type of install.
5. I favor a fully isolated dual battery system using a quality isolator
6. Both batteries can fail when placed in parallel without isolation if one fails.
7. This circuit will provide for self-Jumping. One battery is disconnected until oil pressure builds. The second battery is the one you use as the jumping battery..
8. For self-jumping you use
a. Jumper cables, or
b. Move the starter cable to the second battery, or
c. A use second set of starter cables and starter relay, or
d. A battery management circuit.
9. When the oil pressure swtich is on both batteries are charging/discharging.
10. So the loads are in common until the engine's turned off.
11. I favor splitting the circuits to one or the other of the batteries under all conditions.
a. If one battery is starting to fail,
b. Both are going to take on the charactericts of the bad one.
c. It's like two buckets of water
d. With a common pipe in the bottom
e. And a hole half way up one of the buckets.
f. Because both buckets share a common "bottom" they also cant' be filled any furhter than the bucket with the hole.
g. Try to overfill the "good" bucket only means the "bad" bucket will drain the "good" one down to it's level.
h. In a non isolated dual battery system this can lead to:
h1 Over charging.
h2. Regulator problems.
h3. Alternator problems.
h4. Battery problems.
i. The problem is that often the owner doesn't notice it till it's too late. This is a gradual process.
j. In fainess to this system, using Optima batteries would be a good choice to lesson the problems associated with this sytem.
13. So as you now understand, if one battery is not fully charging... the second one also will not fully charge no matter how fast that alternaor is turning.
14. This limits your ability to "go to the power well," so to speak, and may compermise your ability to self-jump.
15. Here's a good Dual Battery
write up I like.
16. A good dual battery installation is neither hard, nor too expensive, but it does take planning and some work.
17. Study hard, think more, ponder some, and pay your money and take your choice.
18. Best of luck on your choice. [img]images/graemlins/grin.gif[/img]