Let me see if I can explain this without having to write an entire book. First off the body I used on the truck is a 1971 F100, with about 18,000 original miles. The wiring is in excellent shape. OK, here is what I have done. I spliced an F600 gauge cluster into the main wiring harness, before I connected the lights back up, I could hit the left and right turn signal and the light in the cluster indicating right and left would light up but not flash.
OK, so now I have hooked up the front and rear lights. I used the factory plugs for everything and the only wiring I had to fix was at the taillights. I have double checked those connections they are matched and wired correctly. I also replaced both flashers under the dash (didn't know that there where two flashers

So now here is the problem I am having. The four ways work just fine and do what they are supposed to. All the running lights work fine. The headlights and high beams work fine. When I hit my signals though they only flash like twice and than stop. Once it does this it wont work at all. I am leaning towards a ground problem, the only problem with this is I have got 6 individual grounds on the truck. Two off the cab. Two off of the front clip, and just for giggles two off of the bed.
Fix actions I have tried. Re-Checked all my connections to the new cluster. They all are good and insulated so as to not cause a short with shrink wrap. Replaced both flashers. Checked grounds. Checked connections at all the splices and wiring harness connectors. I am at a loss now on what to check. Oh I also checked all the fuses.
Anyone got any ideas! In advance thanks for any and all help!