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Voltage Drop Testing
from my trouble shooting manual..
Does your engine crank slowly or not at all, but when you test the battery and starter both are fine? What about an alternator that puts out its normal charging amperage but can't keep your battery fully charged?
An often overlooked cause...
Understandable frustration from electrical problems… You need to start a process of elimination.
Battery good? does it have the proper cold cranking rating.
Is starter good , test Using a jumper to bypass the solenoid is a trick that will show if the starter motor spins or not. If the starter...
Just asking, if too much advance it will give you slow cranking...By jumping to starter, your eliminating a wire circuit. make sure you have a good ground & try an extra ground to body to engine.
Question...are your starter wires close to the engine block or exhaust manifold or something really...
13.8 to 14.2 volts is what you want & need to run properly…
Are you jumping to battery or directly to starter ?
Question what is setting on timing….ignition advanced too far ?
If it won't crank or slowly, it will be either electrical .. battery, cables, starter.. or a heat soaked starter problems. also Resistance can be probably the root cause in this case.. Check all connection, even removing & sanding contact area's.. When you get it started get your multi meter...