ignition issue some gremlin...

[scottmitchellrose]

I have a 1970 K10 with gremlins that pop up now and again. i put a rebuilt 350 in, new clutch, new dual fan radiator, new temp gauge (among many other things). Had carb issues- rebuilt a holley 4160. Switched to EFI distributor. Couldn't get it to run right; switch distributor then ran fine. If I let it sit a week or 2 timing seems to get all fouled up. I've had bad backfire- literally 'blew up' both new mufflers.... Yesterday I decided to check the ignition- the only 2 wires I checked- 1 and 3- neither were getting a signal. Checked light on another vehicle- it isn't the light. I'm getting 11.7 volts at the ignition wire when cranking it drops to 7.8. battery reads 12.02 volts when off. temp gauge wire is 1.86 volts when cranking and electric choke wire is 8 volts when cranking. anyway, it ran before... now gremlins and backfire. distributor cap is on tight and right. all connections for wiring and plugs/ cap are tight/ on right.