In a Nissan Sentra I had similar problem. Trouble was the steering column mounted on / off switch for the headlamps. Turns out it is a pretty complex switch and the wiring diagram at the dealer revealed that it was connected to the dash lights and other interior lights. About a $75 gamble to see if I had read the diagram correctly, and, praise the Lord, I had. Replacing that turn signal / Headlights on/off switch deal fixed it immediately.
yes you can pretty much turbocharge anything.
B2600 has a carburetor system and B2600i has an injection system.
121 hp
I've attached a link to a B2600i vacuum diagram that has been color coded as well as some additional materials for your reference in the future.
The B2600i does not have a pickup coil, it uses a hall effect sensor located inside the distributor to trigger spark. K6 Mazdatruckin.com
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Under the drivers seat
on the firewall passenger side
3,6 litters
Mazdatruckin.com has a schematic for the B2600i vacuum lines in their tech section, it includes 4wd and cruise control devices. See the attached links below.
4x4 = 4.3
Fuel Injected? In the fuel tank