slow crank no spark to plugs

[bartell]

bus cranks slow yellow spark from coil no spark from plug battery won't take full charge had it tested said it was good cleaned wire connections shortened cables

[turkis-deluxe]

[bartell]

ground from battery to alt stand, second ground from battery to body, ground strap from tranny to tranny mount bolt, not sure where to mount to body, shortened both pos and neg battery wires, 4 gauge from alt to battery, did i miss anything? had the optma battery tested said it was good. it ran ok till i rebuilt the carb and cleaned the plugs now it wont start.

[Eric&Barb]

Clean and dielectric grease all connections in the electrical system after checking each connection for voltage drops with an electrical load on. Clean the connections on the starter, and do same for the starter to transaxle surfaces and starter solenoid to starter body surfaces.

Have you soldered up the internal connections in the fuse box and headlight switch yet?

Any history on the bus, like "just dragged this out of the woods, or barn where it sat for 50 years".
_________________
In Stereo, Where Available!

[western auto]

the most important part of a 6v system is the battery cable size/ (LARGER IS BETTER) and the quality of the ground, if these are good starter may need to be pulled apart and freshened up

[BarryL]